6643256376 has 64 divisors (see below), whose sum is σ = 16861255200. Its totient is φ = 2180763648.

The previous prime is 6643256371. The next prime is 6643256393. The reversal of 6643256376 is 6736523466.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643256371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1323760 + ... + 1328768.

Almost surely, 2^6643256376 is an apocalyptic number.

It is an amenable number.

6643256376 is an abundant number, since it is smaller than the sum of its proper divisors (10217998824).

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

6643256376 is a wasteful number, since it uses less digits than its factorization.

6643256376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5848 (or 5844 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 48.

The square root of 6643256376 is about 81506.1738520463. The cubic root of 6643256376 is about 1879.8664813883.

The spelling of 6643256376 in words is "six billion, six hundred forty-three million, two hundred fifty-six thousand, three hundred seventy-six".