50921020809 has 6 divisors (see below), whose sum is σ = 73552585626. Its totient is φ = 33947347200.

The previous prime is 50921020807. The next prime is 50921020817. The reversal of 50921020809 is 90802012905.

50921020809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 29554767225 + 21366253584 = 171915^2 + 146172^2 .

It is not a de Polignac number, because 50921020809 - 2¹ = 50921020807 is a prime.

It is a super-2 number, since 2×50921020809² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (50921020807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2828945592 + ... + 2828945609.

It is an arithmetic number, because the mean of its divisors is an integer number (12258764271).

Almost surely, 2^50921020809 is an apocalyptic number.

It is an amenable number.

50921020809 is a deficient number, since it is larger than the sum of its proper divisors (22631564817).

50921020809 is a wasteful number, since it uses less digits than its factorization.

50921020809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5657891207 (or 5657891204 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 50921020809 in words is "fifty billion, nine hundred twenty-one million, twenty thousand, eight hundred nine".