16915879997 has 2 divisors, whose sum is σ = 16915879998. Its totient is φ = 16915879996.

The previous prime is 16915879993. The next prime is 16915880057. The reversal of 16915879997 is 79997851961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16855569241 + 60310756 = 129829^2 + 7766^2 .

It is a cyclic number.

It is not a de Polignac number, because 16915879997 - 2² = 16915879993 is a prime.

It is a super-2 number, since 2×16915879997² (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 16915879997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16915879993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8457939998 + 8457939999.

It is an arithmetic number, because the mean of its divisors is an integer number (8457939999).

Almost surely, 2^16915879997 is an apocalyptic number.

It is an amenable number.

16915879997 is a deficient number, since it is larger than the sum of its proper divisors (1).

16915879997 is an equidigital number, since it uses as much as digits as its factorization.

16915879997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77157360, while the sum is 71.

The spelling of 16915879997 in words is "sixteen billion, nine hundred fifteen million, eight hundred seventy-nine thousand, nine hundred ninety-seven".