16801666597 has 2 divisors, whose sum is σ = 16801666598. Its totient is φ = 16801666596.

The previous prime is 16801666573. The next prime is 16801666603. The reversal of 16801666597 is 79566610861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16161019876 + 640646721 = 127126^2 + 25311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16801666597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16801666507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8400833298 + 8400833299.

It is an arithmetic number, because the mean of its divisors is an integer number (8400833299).

Almost surely, 2^16801666597 is an apocalyptic number.

It is an amenable number.

16801666597 is a deficient number, since it is larger than the sum of its proper divisors (1).

16801666597 is an equidigital number, since it uses as much as digits as its factorization.

16801666597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 16801666597 in words is "sixteen billion, eight hundred one million, six hundred sixty-six thousand, five hundred ninety-seven".