61918381711956 has 96 divisors (see below), whose sum is σ = 180134198479872. Its totient is φ = 16081982519040.

The previous prime is 61918381711931. The next prime is 61918381712027. The reversal of 61918381711956 is 65911718381916.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19495815 + ... + 22448241.

It is an arithmetic number, because the mean of its divisors is an integer number (1876397900832).

Almost surely, 2^{61918381711956} is an apocalyptic number.

61918381711956 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

61918381711956 is an abundant number, since it is smaller than the sum of its proper divisors (118215816767916).

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

61918381711956 is a wasteful number, since it uses less digits than its factorization.

61918381711956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2975149 (or 2975147 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 66.

The spelling of 61918381711956 in words is "sixty-one trillion, nine hundred eighteen billion, three hundred eighty-one million, seven hundred eleven thousand, nine hundred fifty-six".