145023205561 has 8 divisors (see below), whose sum is σ = 157695137600. Its totient is φ = 132567887952.

The previous prime is 145023205517. The next prime is 145023205667. The reversal of 145023205561 is 165502320541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145023205561 - 2¹¹ = 145023203513 is a prime.

It is a super-2 number, since 2×145023205561² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145023205511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54152211 + ... + 54154888.

It is an arithmetic number, because the mean of its divisors is an integer number (19711892200).

Almost surely, 2^145023205561 is an apocalyptic number.

It is an amenable number.

145023205561 is a deficient number, since it is larger than the sum of its proper divisors (12671932039).

145023205561 is a wasteful number, since it uses less digits than its factorization.

145023205561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108307215.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 145023205561 in words is "one hundred forty-five billion, twenty-three million, two hundred five thousand, five hundred sixty-one".