100561665 has 32 divisors (see below), whose sum is σ = 164736000. Its totient is φ = 52367040.

The previous prime is 100561639. The next prime is 100561667. The reversal of 100561665 is 566165001.

It is not a de Polignac number, because 100561665 - 2¹⁰ = 100560641 is a prime.

It is a super-2 number, since 2×100561665² = 20225296935144450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100561667) 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, 175830 + ... + 176400.

It is an arithmetic number, because the mean of its divisors is an integer number (5148000).

Almost surely, 2^100561665 is an apocalyptic number.

100561665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100561665 is a deficient number, since it is larger than the sum of its proper divisors (64174335).

100561665 is a wasteful number, since it uses less digits than its factorization.

100561665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 100561665 is about 10028.0439269082. The cubic root of 100561665 is about 465.0262674490.

The spelling of 100561665 in words is "one hundred million, five hundred sixty-one thousand, six hundred sixty-five".