17715478493 has 2 divisors, whose sum is σ = 17715478494. Its totient is φ = 17715478492.

The previous prime is 17715478489. The next prime is 17715478513. The reversal of 17715478493 is 39487451771.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11932940644 + 5782537849 = 109238^2 + 76043^2 .

It is a cyclic number.

It is not a de Polignac number, because 17715478493 - 2² = 17715478489 is a prime.

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 (17715478423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8857739246 + 8857739247.

It is an arithmetic number, because the mean of its divisors is an integer number (8857739247).

Almost surely, 2^17715478493 is an apocalyptic number.

It is an amenable number.

17715478493 is a deficient number, since it is larger than the sum of its proper divisors (1).

17715478493 is an equidigital number, since it uses as much as digits as its factorization.

17715478493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 56.

The spelling of 17715478493 in words is "seventeen billion, seven hundred fifteen million, four hundred seventy-eight thousand, four hundred ninety-three".