16500532591 has 2 divisors, whose sum is σ = 16500532592. Its totient is φ = 16500532590.

The previous prime is 16500532561. The next prime is 16500532613. The reversal of 16500532591 is 19523500561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16500532591 - 2⁹ = 16500532079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16500532591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16500532561) 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, 8250266295 + 8250266296.

It is an arithmetic number, because the mean of its divisors is an integer number (8250266296).

Almost surely, 2^16500532591 is an apocalyptic number.

16500532591 is a deficient number, since it is larger than the sum of its proper divisors (1).

16500532591 is an equidigital number, since it uses as much as digits as its factorization.

16500532591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40500, while the sum is 37.

The spelling of 16500532591 in words is "sixteen billion, five hundred million, five hundred thirty-two thousand, five hundred ninety-one".