8517594639842 has 4 divisors (see below), whose sum is σ = 12776391959766. Its totient is φ = 4258797319920.

The previous prime is 8517594639811. The next prime is 8517594639871. The reversal of 8517594639842 is 2489364957158.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8407164039121 + 110430600721 = 2899511^2 + 332311^2 .

It is a super-4 number, since 4×8517594639842⁴ (a number of 53 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2129398659959 + ... + 2129398659962.

Almost surely, 2^{8517594639842} is an apocalyptic number.

8517594639842 is a deficient number, since it is larger than the sum of its proper divisors (4258797319924).

8517594639842 is a wasteful number, since it uses less digits than its factorization.

8517594639842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4258797319923.

The product of its digits is 522547200, while the sum is 71.

The spelling of 8517594639842 in words is "eight trillion, five hundred seventeen billion, five hundred ninety-four million, six hundred thirty-nine thousand, eight hundred forty-two".