17157378809 has 4 divisors (see below), whose sum is σ = 18166636404. Its totient is φ = 16148121216.

The previous prime is 17157378769. The next prime is 17157378857. The reversal of 17157378809 is 90887375171.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90887375171 = 94309 ⋅963719.

It can be written as a sum of positive squares in 2 ways, for example, as 6718261225 + 10439117584 = 81965^2 + 102172^2 .

It is a cyclic number.

It is not a de Polignac number, because 17157378809 - 2²⁴ = 17140601593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17157378899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504628772 + ... + 504628805.

It is an arithmetic number, because the mean of its divisors is an integer number (4541659101).

Almost surely, 2^17157378809 is an apocalyptic number.

It is an amenable number.

17157378809 is a deficient number, since it is larger than the sum of its proper divisors (1009257595).

17157378809 is a wasteful number, since it uses less digits than its factorization.

17157378809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009257594.

The product of its (nonzero) digits is 2963520, while the sum is 56.

The spelling of 17157378809 in words is "seventeen billion, one hundred fifty-seven million, three hundred seventy-eight thousand, eight hundred nine".