16388500493 has 2 divisors, whose sum is σ = 16388500494. Its totient is φ = 16388500492.

The previous prime is 16388500489. The next prime is 16388500507. The reversal of 16388500493 is 39400588361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14867656489 + 1520844004 = 121933^2 + 38998^2 .

It is a cyclic number.

It is not a de Polignac number, because 16388500493 - 2² = 16388500489 is a prime.

It is a super-2 number, since 2×16388500493² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16388505493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8194250246 + 8194250247.

It is an arithmetic number, because the mean of its divisors is an integer number (8194250247).

Almost surely, 2^16388500493 is an apocalyptic number.

It is an amenable number.

16388500493 is a deficient number, since it is larger than the sum of its proper divisors (1).

16388500493 is an equidigital number, since it uses as much as digits as its factorization.

16388500493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 47.

The spelling of 16388500493 in words is "sixteen billion, three hundred eighty-eight million, five hundred thousand, four hundred ninety-three".