16577440391 has 2 divisors, whose sum is σ = 16577440392. Its totient is φ = 16577440390.

The previous prime is 16577440357. The next prime is 16577440393. The reversal of 16577440391 is 19304477561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16577440391 - 2¹⁰ = 16577439367 is a prime.

Together with 16577440393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16577440393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8288720195 + 8288720196.

It is an arithmetic number, because the mean of its divisors is an integer number (8288720196).

Almost surely, 2^16577440391 is an apocalyptic number.

16577440391 is a deficient number, since it is larger than the sum of its proper divisors (1).

16577440391 is an equidigital number, since it uses as much as digits as its factorization.

16577440391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 16577440391 in words is "sixteen billion, five hundred seventy-seven million, four hundred forty thousand, three hundred ninety-one".