23501565545 has 16 divisors (see below), whose sum is σ = 29162877120. Its totient is φ = 18171177024.

The previous prime is 23501565541. The next prime is 23501565551. The reversal of 23501565545 is 54556510532.

It is a cyclic number.

It is not a de Polignac number, because 23501565545 - 2² = 23501565541 is a prime.

It is a super-2 number, since 2×23501565545² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23501565541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 644075 + ... + 679584.

It is an arithmetic number, because the mean of its divisors is an integer number (1822679820).

Almost surely, 2^23501565545 is an apocalyptic number.

It is an amenable number.

23501565545 is a deficient number, since it is larger than the sum of its proper divisors (5661311575).

23501565545 is a wasteful number, since it uses less digits than its factorization.

23501565545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323784.

The product of its (nonzero) digits is 450000, while the sum is 41.

The spelling of 23501565545 in words is "twenty-three billion, five hundred one million, five hundred sixty-five thousand, five hundred forty-five".