20669377358691 has 24 divisors (see below), whose sum is σ = 29944184961600. Its totient is φ = 13738784328576.

The previous prime is 20669377358683. The next prime is 20669377358719. The reversal of 20669377358691 is 19685377396602.

20669377358691 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 9 + 37 + 7 + 3 + 586 + 9 + 1 = 666.

It is not a de Polignac number, because 20669377358691 - 2³ = 20669377358683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20669377358621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33006391 + ... + 33626783.

It is an arithmetic number, because the mean of its divisors is an integer number (1247674373400).

Almost surely, 2^{20669377358691} is an apocalyptic number.

20669377358691 is a deficient number, since it is larger than the sum of its proper divisors (9274807602909).

20669377358691 is a wasteful number, since it uses less digits than its factorization.

20669377358691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631355 (or 631352 counting only the distinct ones).

The product of its (nonzero) digits is 617258880, while the sum is 72.

The spelling of 20669377358691 in words is "twenty trillion, six hundred sixty-nine billion, three hundred seventy-seven million, three hundred fifty-eight thousand, six hundred ninety-one".