15997101650 has 12 divisors (see below), whose sum is σ = 29754609162. Its totient is φ = 6398840640.

The previous prime is 15997101629. The next prime is 15997101691. The reversal of 15997101650 is 5610179951.

It can be written as a sum of positive squares in 3 ways, for example, as 12636232921 + 3360868729 = 112411^2 + 57973^2 .

It is a super-2 number, since 2×15997101650² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 159970967 + ... + 159971066.

Almost surely, 2^15997101650 is an apocalyptic number.

15997101650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15997101650 is a deficient number, since it is larger than the sum of its proper divisors (13757507512).

15997101650 is a wasteful number, since it uses less digits than its factorization.

15997101650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319942045 (or 319942040 counting only the distinct ones).

The product of its (nonzero) digits is 85050, while the sum is 44.

The spelling of 15997101650 in words is "fifteen billion, nine hundred ninety-seven million, one hundred one thousand, six hundred fifty".