101666665 has 16 divisors (see below), whose sum is σ = 124345728. Its totient is φ = 79785216.

The previous prime is 101666651. The next prime is 101666683. The reversal of 101666665 is 566666101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101666665 is a prime.

It is a super-2 number, since 2×101666665² = 20672221544444450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57322 + ... + 59068.

It is an arithmetic number, because the mean of its divisors is an integer number (7771608).

Almost surely, 2^101666665 is an apocalyptic number.

It is an amenable number.

101666665 is a deficient number, since it is larger than the sum of its proper divisors (22679063).

101666665 is a wasteful number, since it uses less digits than its factorization.

101666665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1968.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 101666665 is about 10082.9888921887. The cubic root of 101666665 is about 466.7233465736.

The spelling of 101666665 in words is "one hundred one million, six hundred sixty-six thousand, six hundred sixty-five".