50861721691 has 32 divisors (see below), whose sum is σ = 57839443200. Its totient is φ = 44324206080.

The previous prime is 50861721679. The next prime is 50861721697. The reversal of 50861721691 is 19612716805.

It is not a de Polignac number, because 50861721691 - 2⁷ = 50861721563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (50861721697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5762880 + ... + 5771698.

It is an arithmetic number, because the mean of its divisors is an integer number (1807482600).

Almost surely, 2^50861721691 is an apocalyptic number.

50861721691 is a deficient number, since it is larger than the sum of its proper divisors (6977721509).

50861721691 is a wasteful number, since it uses less digits than its factorization.

50861721691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9099.

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 50861721691 in words is "fifty billion, eight hundred sixty-one million, seven hundred twenty-one thousand, six hundred ninety-one".