12157507561 has 8 divisors (see below), whose sum is σ = 12806105600. Its totient is φ = 11509782480.

The previous prime is 12157507559. The next prime is 12157507577. The reversal of 12157507561 is 16570575121.

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 12157507561 - 2¹ = 12157507559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12157507541) 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 7 ways as a sum of consecutive naturals, for example, 189546 + ... + 245443.

It is an arithmetic number, because the mean of its divisors is an integer number (1600763200).

Almost surely, 2^12157507561 is an apocalyptic number.

It is an amenable number.

12157507561 is a deficient number, since it is larger than the sum of its proper divisors (648598039).

12157507561 is a wasteful number, since it uses less digits than its factorization.

12157507561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436479.

The product of its (nonzero) digits is 73500, while the sum is 40.

The spelling of 12157507561 in words is "twelve billion, one hundred fifty-seven million, five hundred seven thousand, five hundred sixty-one".