131778345778850 has 12 divisors (see below), whose sum is σ = 245107723148754. Its totient is φ = 52711338311520.

The previous prime is 131778345778829. The next prime is 131778345778889. The reversal of 131778345778850 is 58877543877131.

It can be written as a sum of positive squares in 3 ways, for example, as 73874936072809 + 57903409706041 = 8595053^2 + 7609429^2 .

It is a super-2 number, since 2×131778345778850² (a number of 29 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (74) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1317783457739 + ... + 1317783457838.

Almost surely, 2^{131778345778850} is an apocalyptic number.

131778345778850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131778345778850 is a deficient number, since it is larger than the sum of its proper divisors (113329377369904).

131778345778850 is a wasteful number, since it uses less digits than its factorization.

131778345778850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635566915589 (or 2635566915584 counting only the distinct ones).

The product of its (nonzero) digits is 1106380800, while the sum is 74.

The spelling of 131778345778850 in words is "one hundred thirty-one trillion, seven hundred seventy-eight billion, three hundred forty-five million, seven hundred seventy-eight thousand, eight hundred fifty".