12665037778875 has 24 divisors (see below), whose sum is σ = 22830841438080. Its totient is φ = 6754686814800.

The previous prime is 12665037778843. The next prime is 12665037778903. The reversal of 12665037778875 is 57887773056621.

12665037778875 is a `hidden beast` number, since 1 + 2 + 66 + 50 + 377 + 7 + 88 + 75 = 666.

It is not a de Polignac number, because 12665037778875 - 2⁵ = 12665037778843 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5628904555 + ... + 5628906804.

It is an arithmetic number, because the mean of its divisors is an integer number (951285059920).

Almost surely, 2^{12665037778875} is an apocalyptic number.

12665037778875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12665037778875 is a deficient number, since it is larger than the sum of its proper divisors (10165803659205).

12665037778875 is a wasteful number, since it uses less digits than its factorization.

12665037778875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11257811380 (or 11257811367 counting only the distinct ones).

The product of its (nonzero) digits is 829785600, while the sum is 72.

The spelling of 12665037778875 in words is "twelve trillion, six hundred sixty-five billion, thirty-seven million, seven hundred seventy-eight thousand, eight hundred seventy-five".