61370555904 has 560 divisors, whose sum is σ = 213394591872. Its totient is φ = 17261973504.

The previous prime is 61370555903. The next prime is 61370555941. The reversal of 61370555904 is 40955507316.

61370555904 is a `hidden beast` number, since 6 + 1 + 3 + 7 + 0 + 55 + 590 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 61370555904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61370555903) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 216856947 + ... + 216857229.

Almost surely, 2^61370555904 is an apocalyptic number.

61370555904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61370555904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106697295936).

61370555904 is an abundant number, since it is smaller than the sum of its proper divisors (152024035968).

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

61370555904 is an frugal number, since it uses more digits than its factorization.

61370555904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 567000, while the sum is 45.

The spelling of 61370555904 in words is "sixty-one billion, three hundred seventy million, five hundred fifty-five thousand, nine hundred four".