6451634656 has 24 divisors (see below), whose sum is σ = 12814066944. Its totient is φ = 3197268480.

The previous prime is 6451634647. The next prime is 6451634701. The reversal of 6451634656 is 6564361546.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 888480 + ... + 895711.

It is an arithmetic number, because the mean of its divisors is an integer number (533919456).

Almost surely, 2^6451634656 is an apocalyptic number.

It is an amenable number.

6451634656 is a deficient number, since it is larger than the sum of its proper divisors (6362432288).

6451634656 is a wasteful number, since it uses less digits than its factorization.

6451634656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784314 (or 1784306 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 46.

The square root of 6451634656 is about 80322.0683000631. The cubic root of 6451634656 is about 1861.6152246734.

The spelling of 6451634656 in words is "six billion, four hundred fifty-one million, six hundred thirty-four thousand, six hundred fifty-six".