16456312391 has 4 divisors (see below), whose sum is σ = 16735233000. Its totient is φ = 16177391784.

The previous prime is 16456312339. The next prime is 16456312399. The reversal of 16456312391 is 19321365461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16456312391 - 2²² = 16452118087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16456312399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139460216 + ... + 139460333.

It is an arithmetic number, because the mean of its divisors is an integer number (4183808250).

Almost surely, 2^16456312391 is an apocalyptic number.

16456312391 is a deficient number, since it is larger than the sum of its proper divisors (278920609).

16456312391 is an equidigital number, since it uses as much as digits as its factorization.

16456312391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278920608.

The product of its digits is 116640, while the sum is 41.

The spelling of 16456312391 in words is "sixteen billion, four hundred fifty-six million, three hundred twelve thousand, three hundred ninety-one".