50831620721 has 16 divisors (see below), whose sum is σ = 61167052800. Its totient is φ = 41265849168.

The previous prime is 50831620657. The next prime is 50831620739. The reversal of 50831620721 is 12702613805.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 50831620721 - 2⁶ = 50831620657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (50831620751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472466 + ... + 569988.

It is an arithmetic number, because the mean of its divisors is an integer number (3822940800).

Almost surely, 2^50831620721 is an apocalyptic number.

It is an amenable number.

50831620721 is a deficient number, since it is larger than the sum of its proper divisors (10335432079).

50831620721 is a wasteful number, since it uses less digits than its factorization.

50831620721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101468.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 50831620721 in words is "fifty billion, eight hundred thirty-one million, six hundred twenty thousand, seven hundred twenty-one".