16530312791 has 2 divisors, whose sum is σ = 16530312792. Its totient is φ = 16530312790.

The previous prime is 16530312781. The next prime is 16530312811. The reversal of 16530312791 is 19721303561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16530312791 - 2²⁶ = 16463203927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16530312781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8265156395 + 8265156396.

It is an arithmetic number, because the mean of its divisors is an integer number (8265156396).

Almost surely, 2^16530312791 is an apocalyptic number.

16530312791 is a deficient number, since it is larger than the sum of its proper divisors (1).

16530312791 is an equidigital number, since it uses as much as digits as its factorization.

16530312791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 38.

The spelling of 16530312791 in words is "sixteen billion, five hundred thirty million, three hundred twelve thousand, seven hundred ninety-one".