16642561736 has 64 divisors (see below), whose sum is σ = 31979344320. Its totient is φ = 8117973760.

The previous prime is 16642561729. The next prime is 16642561753. The reversal of 16642561736 is 63716524661.

It is a super-2 number, since 2×16642561736² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25485986 + ... + 25486638.

It is an arithmetic number, because the mean of its divisors is an integer number (499677255).

Almost surely, 2^16642561736 is an apocalyptic number.

It is an amenable number.

16642561736 is a deficient number, since it is larger than the sum of its proper divisors (15336782584).

16642561736 is a wasteful number, since it uses less digits than its factorization.

16642561736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166 (or 1162 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 47.

The spelling of 16642561736 in words is "sixteen billion, six hundred forty-two million, five hundred sixty-one thousand, seven hundred thirty-six".