138571387857 has 24 divisors (see below), whose sum is σ = 229483639424. Its totient is φ = 78930656064.

The previous prime is 138571387831. The next prime is 138571387861. The reversal of 138571387857 is 758783175831.

It is a happy number.

138571387857 is a `hidden beast` number, since 1 + 3 + 8 + 571 + 3 + 8 + 7 + 8 + 57 = 666.

138571387857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138571387857 - 2⁷ = 138571387729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138571387794 and 138571387803.

It is not an unprimeable number, because it can be changed into a prime (138571387817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3493933 + ... + 3533370.

Almost surely, 2^138571387857 is an apocalyptic number.

It is an amenable number.

138571387857 is a deficient number, since it is larger than the sum of its proper divisors (90912251567).

138571387857 is a wasteful number, since it uses less digits than its factorization.

138571387857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7027629 (or 7027626 counting only the distinct ones).

The product of its digits is 39513600, while the sum is 63.

The spelling of 138571387857 in words is "one hundred thirty-eight billion, five hundred seventy-one million, three hundred eighty-seven thousand, eight hundred fifty-seven".