21660100656594 has 16 divisors (see below), whose sum is σ = 43320246913632. Its totient is φ = 7220025952128.

The previous prime is 21660100656553. The next prime is 21660100656613. The reversal of 21660100656594 is 49565600106612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10403397 + ... + 12310599.

It is an arithmetic number, because the mean of its divisors is an integer number (2707515432102).

Almost surely, 2^{21660100656594} is an apocalyptic number.

21660100656594 is an abundant number, since it is smaller than the sum of its proper divisors (21660146257038).

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

21660100656594 is a wasteful number, since it uses less digits than its factorization.

21660100656594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3800041.

The product of its (nonzero) digits is 2332800, while the sum is 51.

The spelling of 21660100656594 in words is "twenty-one trillion, six hundred sixty billion, one hundred million, six hundred fifty-six thousand, five hundred ninety-four".