63839725705 has 24 divisors (see below), whose sum is σ = 89399865672. Its totient is φ = 43635900672.

The previous prime is 63839725699. The next prime is 63839725723. The reversal of 63839725705 is 50752793836.

63839725705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5693155209 + 58146570496 = 75453^2 + 241136^2 .

It is not a de Polignac number, because 63839725705 - 2⁷ = 63839725577 is a prime.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 339562 + ... + 492931.

It is an arithmetic number, because the mean of its divisors is an integer number (3724994403).

Almost surely, 2^63839725705 is an apocalyptic number.

It is an amenable number.

63839725705 is a deficient number, since it is larger than the sum of its proper divisors (25560139967).

63839725705 is a wasteful number, since it uses less digits than its factorization.

63839725705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832825 (or 832818 counting only the distinct ones).

The product of its (nonzero) digits is 9525600, while the sum is 55.

The spelling of 63839725705 in words is "sixty-three billion, eight hundred thirty-nine million, seven hundred twenty-five thousand, seven hundred five".