138857645825657 has 4 divisors (see below), whose sum is σ = 151481068173456. Its totient is φ = 126234223477860.

The previous prime is 138857645825651. The next prime is 138857645825669. The reversal of 138857645825657 is 756528546758831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138857645825657 - 2¹⁴ = 138857645809273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138857645825651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6311711173883 + ... + 6311711173904.

It is an arithmetic number, because the mean of its divisors is an integer number (37870267043364).

Almost surely, 2^{138857645825657} is an apocalyptic number.

It is an amenable number.

138857645825657 is a deficient number, since it is larger than the sum of its proper divisors (12623422347799).

138857645825657 is a wasteful number, since it uses less digits than its factorization.

138857645825657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12623422347798.

The product of its digits is 13547520000, while the sum is 80.

The spelling of 138857645825657 in words is "one hundred thirty-eight trillion, eight hundred fifty-seven billion, six hundred forty-five million, eight hundred twenty-five thousand, six hundred fifty-seven".