61992188920 has 32 divisors (see below), whose sum is σ = 139650753600. Its totient is φ = 24766950528.

The previous prime is 61992188849. The next prime is 61992188927. The reversal of 61992188920 is 2988129916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61992188927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901584 + ... + 967903.

It is an arithmetic number, because the mean of its divisors is an integer number (4364086050).

Almost surely, 2^61992188920 is an apocalyptic number.

It is an amenable number.

61992188920 is an abundant number, since it is smaller than the sum of its proper divisors (77658564680).

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

61992188920 is a wasteful number, since it uses less digits than its factorization.

61992188920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870327 (or 1870323 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 55.

The spelling of 61992188920 in words is "sixty-one billion, nine hundred ninety-two million, one hundred eighty-eight thousand, nine hundred twenty".