7668247921 has 8 divisors (see below), whose sum is σ = 7934747040. Its totient is φ = 7405756512.

The previous prime is 7668247901. The next prime is 7668247931. The reversal of 7668247921 is 1297428667.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7668247921 - 2⁷ = 7668247793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7668247901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998035 + ... + 1005688.

It is an arithmetic number, because the mean of its divisors is an integer number (991843380).

Almost surely, 2^7668247921 is an apocalyptic number.

It is an amenable number.

7668247921 is a deficient number, since it is larger than the sum of its proper divisors (266499119).

7668247921 is a wasteful number, since it uses less digits than its factorization.

7668247921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003855.

The product of its digits is 2032128, while the sum is 52.

The square root of 7668247921 is about 87568.5327101008. The cubic root of 7668247921 is about 1971.9627874084.

The spelling of 7668247921 in words is "seven billion, six hundred sixty-eight million, two hundred forty-seven thousand, nine hundred twenty-one".