16720973177 has 2 divisors, whose sum is σ = 16720973178. Its totient is φ = 16720973176.

The previous prime is 16720973153. The next prime is 16720973197. The reversal of 16720973177 is 77137902761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12046379536 + 4674593641 = 109756^2 + 68371^2 .

It is a cyclic number.

It is not a de Polignac number, because 16720973177 - 2³² = 12426005881 is a prime.

It is not a weakly prime, because it can be changed into another prime (16720973117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360486588 + 8360486589.

It is an arithmetic number, because the mean of its divisors is an integer number (8360486589).

Almost surely, 2^16720973177 is an apocalyptic number.

It is an amenable number.

16720973177 is a deficient number, since it is larger than the sum of its proper divisors (1).

16720973177 is an equidigital number, since it uses as much as digits as its factorization.

16720973177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777924, while the sum is 50.

The spelling of 16720973177 in words is "sixteen billion, seven hundred twenty million, nine hundred seventy-three thousand, one hundred seventy-seven".