61553057220 has 48 divisors (see below), whose sum is σ = 191498401920. Its totient is φ = 16414148448.

The previous prime is 61553057213. The next prime is 61553057233. The reversal of 61553057220 is 2275035516.

61553057220 is a `hidden beast` number, since 6 + 1 + 55 + 30 + 572 + 2 + 0 = 666.

61553057220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 56993032 + ... + 56994111.

It is an arithmetic number, because the mean of its divisors is an integer number (3989550040).

Almost surely, 2^61553057220 is an apocalyptic number.

61553057220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61553057220 is an abundant number, since it is smaller than the sum of its proper divisors (129945344700).

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

61553057220 is a wasteful number, since it uses less digits than its factorization.

61553057220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113987161 (or 113987153 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The spelling of 61553057220 in words is "sixty-one billion, five hundred fifty-three million, fifty-seven thousand, two hundred twenty".