61520833044 has 384 divisors, whose sum is σ = 198916300800. Its totient is φ = 16200898560.

The previous prime is 61520833037. The next prime is 61520833109. The reversal of 61520833044 is 44033802516.

61520833044 is a `hidden beast` number, since 61 + 520 + 8 + 3 + 30 + 44 = 666.

61520833044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 13468449 + ... + 13473015.

It is an arithmetic number, because the mean of its divisors is an integer number (518011200).

Almost surely, 2^61520833044 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 61520833044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99458150400).

61520833044 is an abundant number, since it is smaller than the sum of its proper divisors (137395467756).

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

61520833044 is a wasteful number, since it uses less digits than its factorization.

61520833044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4660 (or 4652 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 61520833044 in words is "sixty-one billion, five hundred twenty million, eight hundred thirty-three thousand, forty-four".