20676650167657 has 4 divisors (see below), whose sum is σ = 22556345637456. Its totient is φ = 18796954697860.

The previous prime is 20676650167609. The next prime is 20676650167669. The reversal of 20676650167657 is 75676105667602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20676650167657 - 2⁴³ = 11880557145449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20676650167057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939847734883 + ... + 939847734904.

It is an arithmetic number, because the mean of its divisors is an integer number (5639086409364).

Almost surely, 2^{20676650167657} is an apocalyptic number.

It is an amenable number.

20676650167657 is a deficient number, since it is larger than the sum of its proper divisors (1879695469799).

20676650167657 is a wasteful number, since it uses less digits than its factorization.

20676650167657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879695469798.

The product of its (nonzero) digits is 133358400, while the sum is 64.

Subtracting 20676650167657 from its reverse (75676105667602), we obtain a palindrome (54999455499945).

The spelling of 20676650167657 in words is "twenty trillion, six hundred seventy-six billion, six hundred fifty million, one hundred sixty-seven thousand, six hundred fifty-seven".