517887809945 has 24 divisors (see below), whose sum is σ = 719050859520. Its totient is φ = 356822215200.

The previous prime is 517887809927. The next prime is 517887809963. The reversal of 517887809945 is 549908788715.

It is an interprime number because it is at equal distance from previous prime (517887809927) and next prime (517887809963).

It is a de Polignac number, because none of the positive numbers 2^k-517887809945 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22515161 + ... + 22538150.

It is an arithmetic number, because the mean of its divisors is an integer number (29960452480).

Almost surely, 2^517887809945 is an apocalyptic number.

517887809945 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

517887809945 is a deficient number, since it is larger than the sum of its proper divisors (201163049575).

517887809945 is a wasteful number, since it uses less digits than its factorization.

517887809945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45053357 (or 45053346 counting only the distinct ones).

The product of its (nonzero) digits is 203212800, while the sum is 71.

The spelling of 517887809945 in words is "five hundred seventeen billion, eight hundred eighty-seven million, eight hundred nine thousand, nine hundred forty-five".