12698999956 has 6 divisors (see below), whose sum is σ = 22223249930. Its totient is φ = 6349499976.

The previous prime is 12698999953. The next prime is 12698999993. The reversal of 12698999956 is 65999989621.

It can be written as a sum of positive squares in only one way, i.e., 9962036100 + 2736963856 = 99810^2 + 52316^2 .

It is a super-2 number, since 2×12698999956² (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 (12698999953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1587374991 + ... + 1587374998.

Almost surely, 2^12698999956 is an apocalyptic number.

It is an amenable number.

12698999956 is a deficient number, since it is larger than the sum of its proper divisors (9524249974).

12698999956 is a wasteful number, since it uses less digits than its factorization.

12698999956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174749993 (or 3174749991 counting only the distinct ones).

The product of its digits is 170061120, while the sum is 73.

The spelling of 12698999956 in words is "twelve billion, six hundred ninety-eight million, nine hundred ninety-nine thousand, nine hundred fifty-six".