139405561856 has 208 divisors, whose sum is σ = 330780101760. Its totient is φ = 58015088640.

The previous prime is 139405561843. The next prime is 139405561859. The reversal of 139405561856 is 658165504931.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 139405561798 and 139405561807.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28337765 + ... + 28342683.

Almost surely, 2^139405561856 is an apocalyptic number.

139405561856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139405561856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165390050880).

139405561856 is an abundant number, since it is smaller than the sum of its proper divisors (191374539904).

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

139405561856 is a wasteful number, since it uses less digits than its factorization.

139405561856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5008 (or 4986 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 53.

The spelling of 139405561856 in words is "one hundred thirty-nine billion, four hundred five million, five hundred sixty-one thousand, eight hundred fifty-six".