8646540921 has 24 divisors (see below), whose sum is σ = 12786561216. Its totient is φ = 5627371680.

The previous prime is 8646540911. The next prime is 8646540941. The reversal of 8646540921 is 1290456468.

8646540921 is a `hidden beast` number, since 86 + 4 + 6 + 540 + 9 + 21 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-8646540921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8646540911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 933091 + ... + 942311.

It is an arithmetic number, because the mean of its divisors is an integer number (532773384).

Almost surely, 2^8646540921 is an apocalyptic number.

It is an amenable number.

8646540921 is a deficient number, since it is larger than the sum of its proper divisors (4140020295).

8646540921 is a wasteful number, since it uses less digits than its factorization.

8646540921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11693 (or 11690 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 8646540921 is about 92986.7782052911. The cubic root of 8646540921 is about 2052.4888210247.

The spelling of 8646540921 in words is "eight billion, six hundred forty-six million, five hundred forty thousand, nine hundred twenty-one".