61331855156 has 72 divisors (see below), whose sum is σ = 128238919200. Its totient is φ = 25492864320.

The previous prime is 61331855149. The next prime is 61331855197. The reversal of 61331855156 is 65155813316.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent 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, 627695 + ... + 718793.

It is an arithmetic number, because the mean of its divisors is an integer number (1781096100).

Almost surely, 2^61331855156 is an apocalyptic number.

It is an amenable number.

61331855156 is an abundant number, since it is smaller than the sum of its proper divisors (66907064044).

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

61331855156 is a wasteful number, since it uses less digits than its factorization.

61331855156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91245 (or 91232 counting only the distinct ones).

The product of its digits is 324000, while the sum is 44.

The spelling of 61331855156 in words is "sixty-one billion, three hundred thirty-one million, eight hundred fifty-five thousand, one hundred fifty-six".