50861721564 has 72 divisors (see below), whose sum is σ = 129514366800. Its totient is φ = 16829148672.

The previous prime is 50861721563. The next prime is 50861721593. The reversal of 50861721564 is 46512716805.

50861721564 is a `hidden beast` number, since 5 + 0 + 8 + 61 + 7 + 21 + 564 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50861721563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15194539 + ... + 15197885.

It is an arithmetic number, because the mean of its divisors is an integer number (1798810650).

Almost surely, 2^50861721564 is an apocalyptic number.

It is an amenable number.

50861721564 is an abundant number, since it is smaller than the sum of its proper divisors (78652645236).

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

50861721564 is a wasteful number, since it uses less digits than its factorization.

50861721564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6339 (or 6334 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 50861721564 in words is "fifty billion, eight hundred sixty-one million, seven hundred twenty-one thousand, five hundred sixty-four".