17951497997 has 2 divisors, whose sum is σ = 17951497998. Its totient is φ = 17951497996.

The previous prime is 17951497919. The next prime is 17951498027. The reversal of 17951497997 is 79979415971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10953506281 + 6997991716 = 104659^2 + 83654^2 .

It is a cyclic number.

It is not a de Polignac number, because 17951497997 - 2²⁰ = 17950449421 is a prime.

It is a super-3 number, since 3×17951497997³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17951497097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8975748998 + 8975748999.

It is an arithmetic number, because the mean of its divisors is an integer number (8975748999).

Almost surely, 2^17951497997 is an apocalyptic number.

It is an amenable number.

17951497997 is a deficient number, since it is larger than the sum of its proper divisors (1).

17951497997 is an equidigital number, since it uses as much as digits as its factorization.

17951497997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45008460, while the sum is 68.

The spelling of 17951497997 in words is "seventeen billion, nine hundred fifty-one million, four hundred ninety-seven thousand, nine hundred ninety-seven".