50000100561 has 6 divisors (see below), whose sum is σ = 72222367490. Its totient is φ = 33333400368.

The previous prime is 50000100551. The next prime is 50000100593. The reversal of 50000100561 is 16500100005.

50000100561 is a `hidden beast` number, since 5 + 0 + 0 + 0 + 0 + 100 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 49932137025 + 67963536 = 223455^2 + 8244^2 .

It is not a de Polignac number, because 50000100561 - 2⁶ = 50000100497 is a prime.

It is a super-2 number, since 2×50000100561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (50000100551) 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, 2777783356 + ... + 2777783373.

Almost surely, 2^50000100561 is an apocalyptic number.

It is an amenable number.

50000100561 is a deficient number, since it is larger than the sum of its proper divisors (22222266929).

50000100561 is a wasteful number, since it uses less digits than its factorization.

50000100561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555566735 (or 5555566732 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

Adding to 50000100561 its reverse (16500100005), we get a palindrome (66500200566).

The spelling of 50000100561 in words is "fifty billion, one hundred thousand, five hundred sixty-one".