16231720523 has 2 divisors, whose sum is σ = 16231720524. Its totient is φ = 16231720522.

The previous prime is 16231720511. The next prime is 16231720553. The reversal of 16231720523 is 32502713261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16231720523 - 2¹⁰ = 16231719499 is a prime.

It is a super-2 number, since 2×16231720523² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16231720523.

It is not a weakly prime, because it can be changed into another prime (16231720553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8115860261 + 8115860262.

It is an arithmetic number, because the mean of its divisors is an integer number (8115860262).

Almost surely, 2^16231720523 is an apocalyptic number.

16231720523 is a deficient number, since it is larger than the sum of its proper divisors (1).

16231720523 is an equidigital number, since it uses as much as digits as its factorization.

16231720523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 16231720523 in words is "sixteen billion, two hundred thirty-one million, seven hundred twenty thousand, five hundred twenty-three".