145508045332181 has 4 divisors (see below), whose sum is σ = 166294908951072. Its totient is φ = 124721181713292.

The previous prime is 145508045332151. The next prime is 145508045332207. The reversal of 145508045332181 is 181233540805541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145508045332181 is a prime.

It is a super-2 number, since 2×145508045332181² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145508045332141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10393431809435 + ... + 10393431809448.

It is an arithmetic number, because the mean of its divisors is an integer number (41573727237768).

Almost surely, 2^{145508045332181} is an apocalyptic number.

It is an amenable number.

145508045332181 is a deficient number, since it is larger than the sum of its proper divisors (20786863618891).

145508045332181 is an equidigital number, since it uses as much as digits as its factorization.

145508045332181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20786863618890.

The product of its (nonzero) digits is 2304000, while the sum is 50.

The spelling of 145508045332181 in words is "one hundred forty-five trillion, five hundred eight billion, forty-five million, three hundred thirty-two thousand, one hundred eighty-one".