20993766179 has 2 divisors, whose sum is σ = 20993766180. Its totient is φ = 20993766178.

The previous prime is 20993766173. The next prime is 20993766181. The reversal of 20993766179 is 97166739902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20993766179 - 2²⁸ = 20725330723 is a prime.

It is a super-3 number, since 3×20993766179³ (a number of 32 digits) contains 333 as substring.

Together with 20993766181, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20993766173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10496883089 + 10496883090.

It is an arithmetic number, because the mean of its divisors is an integer number (10496883090).

Almost surely, 2^20993766179 is an apocalyptic number.

20993766179 is a deficient number, since it is larger than the sum of its proper divisors (1).

20993766179 is an equidigital number, since it uses as much as digits as its factorization.

20993766179 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7715736, while the sum is 59.

The spelling of 20993766179 in words is "twenty billion, nine hundred ninety-three million, seven hundred sixty-six thousand, one hundred seventy-nine".