50813725561 has 9 divisors (see below), whose sum is σ = 51148398639. Its totient is φ = 50481232536.

The previous prime is 50813725541. The next prime is 50813725603. The reversal of 50813725561 is 16552731805.

It is a happy number.

The square root of 50813725561 is 225419.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 46222850025 + 4590875536 = 214995^2 + 67756^2 .

It is not a de Polignac number, because 50813725561 - 2⁷ = 50813725433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50813725511) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 38996836 + ... + 38998138.

Almost surely, 2^50813725561 is an apocalyptic number.

50813725561 is the 225419-th square number.

50813725561 is the 112710-th centered octagonal number.

It is an amenable number.

50813725561 is a deficient number, since it is larger than the sum of its proper divisors (334673078).

50813725561 is an frugal number, since it uses more digits than its factorization.

50813725561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952 (or 1476 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 50813725561 in words is "fifty billion, eight hundred thirteen million, seven hundred twenty-five thousand, five hundred sixty-one".