61938765624 has 32 divisors (see below), whose sum is σ = 154853136000. Its totient is φ = 20645425632.

The previous prime is 61938765599. The next prime is 61938765649. The reversal of 61938765624 is 42656783916.

It is a Cunningham number, because it is equal to 248875²-1.

It is an interprime number because it is at equal distance from previous prime (61938765599) and next prime (61938765649).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 964387 + ... + 1026605.

It is an arithmetic number, because the mean of its divisors is an integer number (4839160500).

Almost surely, 2^61938765624 is an apocalyptic number.

It is an amenable number.

61938765624 is an abundant number, since it is smaller than the sum of its proper divisors (92914370376).

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

61938765624 is a wasteful number, since it uses less digits than its factorization.

61938765624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103707 (or 103703 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 57.

The spelling of 61938765624 in words is "sixty-one billion, nine hundred thirty-eight million, seven hundred sixty-five thousand, six hundred twenty-four".