8668874777521 has 4 divisors (see below), whose sum is σ = 9907285460032. Its totient is φ = 7430464095012.

The previous prime is 8668874777509. The next prime is 8668874777551. The reversal of 8668874777521 is 1257774788668.

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 8668874777521 - 2⁵ = 8668874777489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8668874777501) 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, 619205341245 + ... + 619205341258.

It is an arithmetic number, because the mean of its divisors is an integer number (2476821365008).

Almost surely, 2^{8668874777521} is an apocalyptic number.

It is an amenable number.

8668874777521 is a deficient number, since it is larger than the sum of its proper divisors (1238410682511).

8668874777521 is a wasteful number, since it uses less digits than its factorization.

8668874777521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238410682510.

The product of its digits is 1770209280, while the sum is 76.

The spelling of 8668874777521 in words is "eight trillion, six hundred sixty-eight billion, eight hundred seventy-four million, seven hundred seventy-seven thousand, five hundred twenty-one".