61256603634 has 32 divisors (see below), whose sum is σ = 127417125120. Its totient is φ = 19615519872.

The previous prime is 61256603567. The next prime is 61256603641. The reversal of 61256603634 is 43630665216.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1728859 + ... + 1763934.

It is an arithmetic number, because the mean of its divisors is an integer number (3981785160).

Almost surely, 2^61256603634 is an apocalyptic number.

61256603634 is an abundant number, since it is smaller than the sum of its proper divisors (66160521486).

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

61256603634 is a wasteful number, since it uses less digits than its factorization.

61256603634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3492914.

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 61256603634 in words is "sixty-one billion, two hundred fifty-six million, six hundred three thousand, six hundred thirty-four".