517585414661 has 4 divisors (see below), whose sum is σ = 591526188192. Its totient is φ = 443644641132.

The previous prime is 517585414649. The next prime is 517585414691. The reversal of 517585414661 is 166414585715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 517585414661 - 2²² = 517581220357 is a prime.

It is a super-2 number, since 2×517585414661² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517585414691) 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, 36970386755 + ... + 36970386768.

It is an arithmetic number, because the mean of its divisors is an integer number (147881547048).

Almost surely, 2^517585414661 is an apocalyptic number.

It is an amenable number.

517585414661 is a deficient number, since it is larger than the sum of its proper divisors (73940773531).

517585414661 is an equidigital number, since it uses as much as digits as its factorization.

517585414661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73940773530.

The product of its digits is 4032000, while the sum is 53.

The spelling of 517585414661 in words is "five hundred seventeen billion, five hundred eighty-five million, four hundred fourteen thousand, six hundred sixty-one".