101666605 has 16 divisors (see below), whose sum is σ = 126690480. Its totient is φ = 78227968.

The previous prime is 101666603. The next prime is 101666623. The reversal of 101666605 is 506666101.

It can be written as a sum of positive squares in 8 ways, for example, as 1085764 + 100580841 = 1042^2 + 10029^2 .

It is a cyclic number.

It is not a de Polignac number, because 101666605 - 2¹ = 101666603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101666603) 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, 41289 + ... + 43681.

It is an arithmetic number, because the mean of its divisors is an integer number (7918155).

Almost surely, 2^101666605 is an apocalyptic number.

It is an amenable number.

101666605 is a deficient number, since it is larger than the sum of its proper divisors (25023875).

101666605 is a wasteful number, since it uses less digits than its factorization.

101666605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 101666605 is about 10082.9859168800. The cubic root of 101666605 is about 466.7232547592.

The spelling of 101666605 in words is "one hundred one million, six hundred sixty-six thousand, six hundred five".