131278378415238 has 48 divisors (see below), whose sum is σ = 286442179934976. Its totient is φ = 43451138242800.

The previous prime is 131278378415083. The next prime is 131278378415243. The reversal of 131278378415238 is 832514873872131.

131278378415238 is a `hidden beast` number, since 1 + 3 + 1 + 2 + 78 + 37 + 8 + 4 + 1 + 523 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3910506 + ... + 16668797.

It is an arithmetic number, because the mean of its divisors is an integer number (5967545415312).

Almost surely, 2^{131278378415238} is an apocalyptic number.

131278378415238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

131278378415238 is an abundant number, since it is smaller than the sum of its proper divisors (155163801519738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131278378415238 is a wasteful number, since it uses less digits than its factorization.

131278378415238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20581809 (or 20581806 counting only the distinct ones).

The product of its digits is 54190080, while the sum is 63.

The spelling of 131278378415238 in words is "one hundred thirty-one trillion, two hundred seventy-eight billion, three hundred seventy-eight million, four hundred fifteen thousand, two hundred thirty-eight".