11875721421765 has 16 divisors (see below), whose sum is σ = 19359666620928. Its totient is φ = 6214213976256.

The previous prime is 11875721421719. The next prime is 11875721421803. The reversal of 11875721421765 is 56712412757811.

It is not a de Polignac number, because 11875721421765 - 2⁷ = 11875721421637 is a prime.

It is a super-2 number, since 2×11875721421765² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7469006389 + ... + 7469007978.

It is an arithmetic number, because the mean of its divisors is an integer number (1209979163808).

Almost surely, 2^{11875721421765} is an apocalyptic number.

11875721421765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11875721421765 is a deficient number, since it is larger than the sum of its proper divisors (7483945199163).

11875721421765 is a wasteful number, since it uses less digits than its factorization.

11875721421765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14938014428.

The product of its digits is 6585600, while the sum is 57.

The spelling of 11875721421765 in words is "eleven trillion, eight hundred seventy-five billion, seven hundred twenty-one million, four hundred twenty-one thousand, seven hundred sixty-five".