8617194657921 has 4 divisors (see below), whose sum is σ = 11489592877232. Its totient is φ = 5744796438612.

The previous prime is 8617194657899. The next prime is 8617194657931. The reversal of 8617194657921 is 1297564917168.

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 8617194657921 - 2⁶ = 8617194657857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8617194657931) 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, 1436199109651 + ... + 1436199109656.

It is an arithmetic number, because the mean of its divisors is an integer number (2872398219308).

Almost surely, 2^{8617194657921} is an apocalyptic number.

It is an amenable number.

8617194657921 is a deficient number, since it is larger than the sum of its proper divisors (2872398219311).

8617194657921 is a wasteful number, since it uses less digits than its factorization.

8617194657921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872398219310.

The product of its digits is 45722880, while the sum is 66.

The spelling of 8617194657921 in words is "eight trillion, six hundred seventeen billion, one hundred ninety-four million, six hundred fifty-seven thousand, nine hundred twenty-one".