12691356004840 has 64 divisors (see below), whose sum is σ = 28819082120400. Its totient is φ = 5029697452032.

The previous prime is 12691356004763. The next prime is 12691356004843. The reversal of 12691356004840 is 4840065319621.

It can be written as a sum of positive squares in 8 ways, for example, as 8488470596004 + 4202885408836 = 2913498^2 + 2050094^2 .

It is a super-2 number, since 2×12691356004840² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12691356004843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93641764 + ... + 93777196.

Almost surely, 2^{12691356004840} is an apocalyptic number.

12691356004840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12691356004840 is an abundant number, since it is smaller than the sum of its proper divisors (16127726115560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12691356004840 is a wasteful number, since it uses less digits than its factorization.

12691356004840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157046 (or 157042 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 12691356004840 in words is "twelve trillion, six hundred ninety-one billion, three hundred fifty-six million, four thousand, eight hundred forty".