6642361256 has 8 divisors (see below), whose sum is σ = 12454427370. Its totient is φ = 3321180624.

The previous prime is 6642361237. The next prime is 6642361277. The reversal of 6642361256 is 6521632466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4476948100 + 2165413156 = 66910^2 + 46534^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415147571 + ... + 415147586.

Almost surely, 2^6642361256 is an apocalyptic number.

It is an amenable number.

6642361256 is a deficient number, since it is larger than the sum of its proper divisors (5812066114).

6642361256 is a wasteful number, since it uses less digits than its factorization.

6642361256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830295163 (or 830295159 counting only the distinct ones).

The product of its digits is 311040, while the sum is 41.

The square root of 6642361256 is about 81500.6825492891. The cubic root of 6642361256 is about 1879.7820458058.

The spelling of 6642361256 in words is "six billion, six hundred forty-two million, three hundred sixty-one thousand, two hundred fifty-six".