15561601597 has 16 divisors (see below), whose sum is σ = 16536384000. Its totient is φ = 14603062320.

The previous prime is 15561601591. The next prime is 15561601609. The reversal of 15561601597 is 79510616551.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 15561601597 - 2⁷ = 15561601469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15561601591) 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, 849222 + ... + 867352.

It is an arithmetic number, because the mean of its divisors is an integer number (1033524000).

Almost surely, 2^15561601597 is an apocalyptic number.

It is an amenable number.

15561601597 is a deficient number, since it is larger than the sum of its proper divisors (974782403).

15561601597 is a wasteful number, since it uses less digits than its factorization.

15561601597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18576.

The product of its (nonzero) digits is 283500, while the sum is 46.

The spelling of 15561601597 in words is "fifteen billion, five hundred sixty-one million, six hundred one thousand, five hundred ninety-seven".