16315756591 has 4 divisors (see below), whose sum is σ = 16357699800. Its totient is φ = 16273813384.

The previous prime is 16315756553. The next prime is 16315756637. The reversal of 16315756591 is 19565751361.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16315756591 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 (16315756531) 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, 20971021 + ... + 20971798.

It is an arithmetic number, because the mean of its divisors is an integer number (4089424950).

Almost surely, 2^16315756591 is an apocalyptic number.

16315756591 is a deficient number, since it is larger than the sum of its proper divisors (41943209).

16315756591 is an equidigital number, since it uses as much as digits as its factorization.

16315756591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41943208.

The product of its digits is 850500, while the sum is 49.

The spelling of 16315756591 in words is "sixteen billion, three hundred fifteen million, seven hundred fifty-six thousand, five hundred ninety-one".