61999940304 has 480 divisors, whose sum is σ = 196449926400. Its totient is φ = 18161418240.

The previous prime is 61999940291. The next prime is 61999940329. The reversal of 61999940304 is 40304999916.

61999940304 is a `hidden beast` number, since 61 + 99 + 99 + 403 + 0 + 4 = 666.

61999940304 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61999940304² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 446042667 + ... + 446042805.

It is an arithmetic number, because the mean of its divisors is an integer number (409270680).

Almost surely, 2^61999940304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61999940304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98224963200).

61999940304 is an abundant number, since it is smaller than the sum of its proper divisors (134449986096).

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

61999940304 is a wasteful number, since it uses less digits than its factorization.

61999940304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 54.

The spelling of 61999940304 in words is "sixty-one billion, nine hundred ninety-nine million, nine hundred forty thousand, three hundred four".