61781992919160 has 64 divisors (see below), whose sum is σ = 185346877294080. Its totient is φ = 16475118241920.

The previous prime is 61781992919147. The next prime is 61781992919177. The reversal of 61781992919160 is 6191929918716.

It is a congruent 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, 26093845 + ... + 28362875.

It is an arithmetic number, because the mean of its divisors is an integer number (2896044957720).

Almost surely, 2^{61781992919160} is an apocalyptic number.

61781992919160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61781992919160 is an abundant number, since it is smaller than the sum of its proper divisors (123564884374920).

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

61781992919160 is a wasteful number, since it uses less digits than its factorization.

61781992919160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2495948 (or 2495944 counting only the distinct ones).

The product of its (nonzero) digits is 26453952, while the sum is 69.

The spelling of 61781992919160 in words is "sixty-one trillion, seven hundred eighty-one billion, nine hundred ninety-two million, nine hundred nineteen thousand, one hundred sixty".