61929799744 has 28 divisors (see below), whose sum is σ = 127129603500. Its totient is φ = 29897143808.

The previous prime is 61929799721. The next prime is 61929799777. The reversal of 61929799744 is 44799792916.

It can be written as a sum of positive squares in 2 ways, for example, as 26778049600 + 35151750144 = 163640^2 + 187488^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61929799744.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16681819 + ... + 16685530.

Almost surely, 2^61929799744 is an apocalyptic number.

61929799744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61929799744 is an abundant number, since it is smaller than the sum of its proper divisors (65199803756).

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

61929799744 is a wasteful number, since it uses less digits than its factorization.

61929799744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33367390 (or 33367380 counting only the distinct ones).

The product of its digits is 61725888, while the sum is 67.

The spelling of 61929799744 in words is "sixty-one billion, nine hundred twenty-nine million, seven hundred ninety-nine thousand, seven hundred forty-four".