145145423122201 has 4 divisors (see below), whose sum is σ = 149068272395812. Its totient is φ = 141222573848592.

The previous prime is 145145423122199. The next prime is 145145423122237. The reversal of 145145423122201 is 102221324541541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134213406672601 + 10932016449600 = 11585051^2 + 3306360^2 .

It is a cyclic number.

It is not a de Polignac number, because 145145423122201 - 2¹ = 145145423122199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 3922849273573 = 145145423122201 / (1 + 4 + 5 + 1 + 4 + 5 + 4 + 2 + 3 + 1 + 2 + 2 + 2 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145145423122291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1961424636750 + ... + 1961424636823.

It is an arithmetic number, because the mean of its divisors is an integer number (37267068098953).

Almost surely, 2^{145145423122201} is an apocalyptic number.

It is an amenable number.

145145423122201 is a deficient number, since it is larger than the sum of its proper divisors (3922849273611).

145145423122201 is an equidigital number, since it uses as much as digits as its factorization.

145145423122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3922849273610.

The product of its (nonzero) digits is 76800, while the sum is 37.

Adding to 145145423122201 its reverse (102221324541541), we get a palindrome (247366747663742).

The spelling of 145145423122201 in words is "one hundred forty-five trillion, one hundred forty-five billion, four hundred twenty-three million, one hundred twenty-two thousand, two hundred one".