100550100561 has 32 divisors (see below), whose sum is σ = 139475880960. Its totient is φ = 64364544000.

The previous prime is 100550100491. The next prime is 100550100589. The reversal of 100550100561 is 165001055001.

It is not a de Polignac number, because 100550100561 - 2²³ = 100541711953 is a prime.

It is a super-2 number, since 2×100550100561² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100550100061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6974961 + ... + 6989361.

It is an arithmetic number, because the mean of its divisors is an integer number (4358621280).

Almost surely, 2^100550100561 is an apocalyptic number.

It is an amenable number.

100550100561 is a deficient number, since it is larger than the sum of its proper divisors (38925780399).

100550100561 is a wasteful number, since it uses less digits than its factorization.

100550100561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15017.

The product of its (nonzero) digits is 750, while the sum is 24.

Adding to 100550100561 its reverse (165001055001), we get a palindrome (265551155562).

The spelling of 100550100561 in words is "one hundred billion, five hundred fifty million, one hundred thousand, five hundred sixty-one".