6687651456 has 48 divisors (see below), whose sum is σ = 19244417010. Its totient is φ = 2229216768.

The previous prime is 6687651449. The next prime is 6687651463. The reversal of 6687651456 is 6541567866.

6687651456 is a `hidden beast` number, since 6 + 6 + 8 + 76 + 514 + 56 = 666.

It is an interprime number because it is at equal distance from previous prime (6687651449) and next prime (6687651463).

It can be written as a sum of positive squares in only one way, i.e., 5865109056 + 822542400 = 76584^2 + 28680^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2901475 + ... + 2903778.

Almost surely, 2^6687651456 is an apocalyptic number.

It is an amenable number.

6687651456 is an abundant number, since it is smaller than the sum of its proper divisors (12556765554).

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

6687651456 is a wasteful number, since it uses less digits than its factorization.

6687651456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5805273 (or 5805258 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The square root of 6687651456 is about 81778.0621927421. The cubic root of 6687651456 is about 1884.0447336803.

The spelling of 6687651456 in words is "six billion, six hundred eighty-seven million, six hundred fifty-one thousand, four hundred fifty-six".