16165601559 has 24 divisors (see below), whose sum is σ = 23699579904. Its totient is φ = 10616130000.

The previous prime is 16165601533. The next prime is 16165601567. The reversal of 16165601559 is 95510656161.

16165601559 is a `hidden beast` number, since 16 + 16 + 560 + 15 + 59 = 666.

It is not a de Polignac number, because 16165601559 - 2⁹ = 16165601047 is a prime.

It is a super-2 number, since 2×16165601559² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16165601509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 776334 + ... + 796884.

It is an arithmetic number, because the mean of its divisors is an integer number (987482496).

Almost surely, 2^16165601559 is an apocalyptic number.

16165601559 is a deficient number, since it is larger than the sum of its proper divisors (7533978345).

16165601559 is a wasteful number, since it uses less digits than its factorization.

16165601559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21859 (or 21856 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The spelling of 16165601559 in words is "sixteen billion, one hundred sixty-five million, six hundred one thousand, five hundred fifty-nine".