6464156221 has 8 divisors (see below), whose sum is σ = 6475702688. Its totient is φ = 6452622000.

The previous prime is 6464156207. The next prime is 6464156243. The reversal of 6464156221 is 1226514646.

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 6464156221 - 2⁵ = 6464156189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6464157221) 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, 2174266 + ... + 2177236.

It is an arithmetic number, because the mean of its divisors is an integer number (809462836).

Almost surely, 2^6464156221 is an apocalyptic number.

It is an amenable number.

6464156221 is a deficient number, since it is larger than the sum of its proper divisors (11546467).

6464156221 is a wasteful number, since it uses less digits than its factorization.

6464156221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6123.

The product of its digits is 69120, while the sum is 37.

The square root of 6464156221 is about 80399.9764987528. The cubic root of 6464156221 is about 1862.8188096566.

The spelling of 6464156221 in words is "six billion, four hundred sixty-four million, one hundred fifty-six thousand, two hundred twenty-one".