61019404992 has 504 divisors, whose sum is σ = 218260879200. Its totient is φ = 15958425600.

The previous prime is 61019404973. The next prime is 61019405017. The reversal of 61019404992 is 29940491016.

It is a tau number, because it is divible by the number of its divisors (504).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 101529492 + ... + 101530092.

It is an arithmetic number, because the mean of its divisors is an integer number (433057300).

Almost surely, 2^61019404992 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 61019404992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109130439600).

61019404992 is an abundant number, since it is smaller than the sum of its proper divisors (157241474208).

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

61019404992 is a wasteful number, since it uses less digits than its factorization.

61019404992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801 (or 775 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 61019404992 in words is "sixty-one billion, nineteen million, four hundred four thousand, nine hundred ninety-two".