6456616621 has 8 divisors (see below), whose sum is σ = 7946605184. Its totient is φ = 5108531760.

The previous prime is 6456616591. The next prime is 6456616631. The reversal of 6456616621 is 1266166546.

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 6456616621 - 2⁵ = 6456616589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6456616631) 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, 35475825 + ... + 35476006.

It is an arithmetic number, because the mean of its divisors is an integer number (993325648).

Almost surely, 2^6456616621 is an apocalyptic number.

It is an amenable number.

6456616621 is a deficient number, since it is larger than the sum of its proper divisors (1489988563).

6456616621 is a wasteful number, since it uses less digits than its factorization.

6456616621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70951851.

The product of its digits is 311040, while the sum is 43.

The square root of 6456616621 is about 80353.0747451521. The cubic root of 6456616621 is about 1862.0942823670.

The spelling of 6456616621 in words is "six billion, four hundred fifty-six million, six hundred sixteen thousand, six hundred twenty-one".