11785778631 has 24 divisors (see below), whose sum is σ = 18780212880. Its totient is φ = 7062633600.

The previous prime is 11785778591. The next prime is 11785778633. The reversal of 11785778631 is 13687758711.

11785778631 is a `hidden beast` number, since 1 + 1 + 7 + 8 + 577 + 8 + 63 + 1 = 666.

It is not a de Polignac number, because 11785778631 - 2⁷ = 11785778503 is a prime.

It is a super-2 number, since 2×11785778631² (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 (11785778633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 660000 + ... + 677621.

It is an arithmetic number, because the mean of its divisors is an integer number (782508870).

Almost surely, 2^11785778631 is an apocalyptic number.

11785778631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11785778631 is a deficient number, since it is larger than the sum of its proper divisors (6994434249).

11785778631 is a wasteful number, since it uses less digits than its factorization.

11785778631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337727 (or 1337724 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 54.

The spelling of 11785778631 in words is "eleven billion, seven hundred eighty-five million, seven hundred seventy-eight thousand, six hundred thirty-one".