61255856664 has 80 divisors (see below), whose sum is σ = 180603317400. Its totient is φ = 19343950848.

The previous prime is 61255856647. The next prime is 61255856671. The reversal of 61255856664 is 46665855216.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 61255856664.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2475337 + ... + 2499960.

Almost surely, 2^61255856664 is an apocalyptic number.

It is an amenable number.

61255856664 is an abundant number, since it is smaller than the sum of its proper divisors (119347460736).

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

61255856664 is a wasteful number, since it uses less digits than its factorization.

61255856664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4975334 (or 4975321 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 54.

The spelling of 61255856664 in words is "sixty-one billion, two hundred fifty-five million, eight hundred fifty-six thousand, six hundred sixty-four".