100561866 has 8 divisors (see below), whose sum is σ = 201123744. Its totient is φ = 33520620.

The previous prime is 100561859. The next prime is 100561871. The reversal of 100561866 is 668165001.

It is a sphenic number, since it is the product of 3 distinct primes.

100561866 is an admirable number.

It is a super-2 number, since 2×100561866² = 20225377786803912, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8380150 + ... + 8380161.

It is an arithmetic number, because the mean of its divisors is an integer number (25140468).

Almost surely, 2^100561866 is an apocalyptic number.

100561866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

100561866 is a wasteful number, since it uses less digits than its factorization.

100561866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16760316.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 100561866 is about 10028.0539487978. The cubic root of 100561866 is about 465.0265772762.

The spelling of 100561866 in words is "one hundred million, five hundred sixty-one thousand, eight hundred sixty-six".