16977440647 has 2 divisors, whose sum is σ = 16977440648. Its totient is φ = 16977440646.

The previous prime is 16977440603. The next prime is 16977440659. The reversal of 16977440647 is 74604477961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16977440647 - 2²³ = 16969052039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16977440147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8488720323 + 8488720324.

It is an arithmetic number, because the mean of its divisors is an integer number (8488720324).

Almost surely, 2^16977440647 is an apocalyptic number.

16977440647 is a deficient number, since it is larger than the sum of its proper divisors (1).

16977440647 is an equidigital number, since it uses as much as digits as its factorization.

16977440647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7112448, while the sum is 55.

The spelling of 16977440647 in words is "sixteen billion, nine hundred seventy-seven million, four hundred forty thousand, six hundred forty-seven".