7613921665 has 16 divisors (see below), whose sum is σ = 11056182912. Its totient is φ = 4913858304.

The previous prime is 7613921657. The next prime is 7613921671. The reversal of 7613921665 is 5661293167.

It is a cyclic number.

It is not a de Polignac number, because 7613921665 - 2³ = 7613921657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6397659 + ... + 6398848.

It is an arithmetic number, because the mean of its divisors is an integer number (691011432).

Almost surely, 2^7613921665 is an apocalyptic number.

It is an amenable number.

7613921665 is a deficient number, since it is larger than the sum of its proper divisors (3442261247).

7613921665 is a wasteful number, since it uses less digits than its factorization.

7613921665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12796536.

The product of its digits is 408240, while the sum is 46.

The square root of 7613921665 is about 87257.7885635431. The cubic root of 7613921665 is about 1967.2949091079.

The spelling of 7613921665 in words is "seven billion, six hundred thirteen million, nine hundred twenty-one thousand, six hundred sixty-five".