16506737665 has 16 divisors (see below), whose sum is σ = 22192845120. Its totient is φ = 11680441920.

The previous prime is 16506737657. The next prime is 16506737671. The reversal of 16506737665 is 56673760561.

It is a happy number.

It is not a de Polignac number, because 16506737665 - 2³ = 16506737657 is a prime.

It is a super-2 number, since 2×16506737665² (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, 4053675 + ... + 4057744.

It is an arithmetic number, because the mean of its divisors is an integer number (1387052820).

Almost surely, 2^16506737665 is an apocalyptic number.

It is an amenable number.

16506737665 is a deficient number, since it is larger than the sum of its proper divisors (5686107455).

16506737665 is a wasteful number, since it uses less digits than its factorization.

16506737665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8111472.

The product of its (nonzero) digits is 4762800, while the sum is 52.

The spelling of 16506737665 in words is "sixteen billion, five hundred six million, seven hundred thirty-seven thousand, six hundred sixty-five".