12691338257015 has 32 divisors (see below), whose sum is σ = 16904986675200. Its totient is φ = 9068640891520.

The previous prime is 12691338257009. The next prime is 12691338257053. The reversal of 12691338257015 is 51075283319621.

It is not a de Polignac number, because 12691338257015 - 2¹² = 12691338252919 is a prime.

It is a super-2 number, since 2×12691338257015² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4842941 + ... + 6988329.

It is an arithmetic number, because the mean of its divisors is an integer number (528280833600).

Almost surely, 2^{12691338257015} is an apocalyptic number.

12691338257015 is a deficient number, since it is larger than the sum of its proper divisors (4213648418185).

12691338257015 is a wasteful number, since it uses less digits than its factorization.

12691338257015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147287.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 12691338257015 in words is "twelve trillion, six hundred ninety-one billion, three hundred thirty-eight million, two hundred fifty-seven thousand, fifteen".