6464321556 has 48 divisors (see below), whose sum is σ = 18805301760. Its totient is φ = 1679044320.

The previous prime is 6464321533. The next prime is 6464321561. The reversal of 6464321556 is 6551234646.

It is a super-2 number, since 2×6464321556² = 83574906358732522272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3497086 + ... + 3498933.

It is an arithmetic number, because the mean of its divisors is an integer number (391777120).

Almost surely, 2^6464321556 is an apocalyptic number.

6464321556 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6464321556 is an abundant number, since it is smaller than the sum of its proper divisors (12340980204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6464321556 is a wasteful number, since it uses less digits than its factorization.

6464321556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6996044 (or 6996042 counting only the distinct ones).

The product of its digits is 518400, while the sum is 42.

The square root of 6464321556 is about 80401.0046952151. The cubic root of 6464321556 is about 1862.8346914161.

The spelling of 6464321556 in words is "six billion, four hundred sixty-four million, three hundred twenty-one thousand, five hundred fifty-six".