101656661605 has 16 divisors (see below), whose sum is σ = 122571474480. Its totient is φ = 80936685568.

The previous prime is 101656661597. The next prime is 101656661627. The reversal of 101656661605 is 506166656101.

It can be written as a sum of positive squares in 8 ways, for example, as 4286451841 + 97370209764 = 65471^2 + 312042^2 .

It is a cyclic number.

It is not a de Polignac number, because 101656661605 - 2³ = 101656661597 is a prime.

It is a congruent 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, 2487981 + ... + 2528509.

It is an arithmetic number, because the mean of its divisors is an integer number (7660717155).

Almost surely, 2^101656661605 is an apocalyptic number.

It is an amenable number.

101656661605 is a deficient number, since it is larger than the sum of its proper divisors (20914812875).

101656661605 is a wasteful number, since it uses less digits than its factorization.

101656661605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42920.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 101656661605 in words is "one hundred one billion, six hundred fifty-six million, six hundred sixty-one thousand, six hundred five".