100561125261 has 16 divisors (see below), whose sum is σ = 138740616000. Its totient is φ = 64712379648.

The previous prime is 100561125233. The next prime is 100561125263. The reversal of 100561125261 is 162521165001.

It is not a de Polignac number, because 100561125261 - 2¹⁷ = 100560994189 is a prime.

It is a super-2 number, since 2×100561125261² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100561125263) 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, 196965 + ... + 489813.

It is an arithmetic number, because the mean of its divisors is an integer number (8671288500).

Almost surely, 2^100561125261 is an apocalyptic number.

It is an amenable number.

100561125261 is a deficient number, since it is larger than the sum of its proper divisors (38179490739).

100561125261 is a wasteful number, since it uses less digits than its factorization.

100561125261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296828.

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 100561125261 in words is "one hundred billion, five hundred sixty-one million, one hundred twenty-five thousand, two hundred sixty-one".