16520501693 has 2 divisors, whose sum is σ = 16520501694. Its totient is φ = 16520501692.

The previous prime is 16520501633. The next prime is 16520501743. The reversal of 16520501693 is 39610502561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11915250649 + 4605251044 = 109157^2 + 67862^2 .

It is a cyclic number.

It is not a de Polignac number, because 16520501693 - 2⁶ = 16520501629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16520501633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8260250846 + 8260250847.

It is an arithmetic number, because the mean of its divisors is an integer number (8260250847).

Almost surely, 2^16520501693 is an apocalyptic number.

It is an amenable number.

16520501693 is a deficient number, since it is larger than the sum of its proper divisors (1).

16520501693 is an equidigital number, since it uses as much as digits as its factorization.

16520501693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 38.

The spelling of 16520501693 in words is "sixteen billion, five hundred twenty million, five hundred one thousand, six hundred ninety-three".