139405561857 has 6 divisors (see below), whose sum is σ = 201363589362. Its totient is φ = 92937041232.

The previous prime is 139405561843. The next prime is 139405561859. The reversal of 139405561857 is 758165504931.

139405561857 is a `hidden beast` number, since 1 + 3 + 9 + 4 + 0 + 556 + 1 + 85 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 105885810801 + 33519751056 = 325401^2 + 183084^2 .

It is not a de Polignac number, because 139405561857 - 2²⁶ = 139338452993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139405561859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7744753428 + ... + 7744753445.

It is an arithmetic number, because the mean of its divisors is an integer number (33560598227).

Almost surely, 2^139405561857 is an apocalyptic number.

It is an amenable number.

139405561857 is a deficient number, since it is larger than the sum of its proper divisors (61958027505).

139405561857 is a wasteful number, since it uses less digits than its factorization.

139405561857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15489506879 (or 15489506876 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 54.

The spelling of 139405561857 in words is "one hundred thirty-nine billion, four hundred five million, five hundred sixty-one thousand, eight hundred fifty-seven".