647670651 has 16 divisors (see below), whose sum is σ = 915657600. Its totient is φ = 406064448.

The previous prime is 647670637. The next prime is 647670691. The reversal of 647670651 is 156076746.

It is not a de Polignac number, because 647670651 - 2⁹ = 647670139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647670691) 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, 33661 + ... + 49278.

It is an arithmetic number, because the mean of its divisors is an integer number (57228600).

Almost surely, 2^647670651 is an apocalyptic number.

647670651 is a deficient number, since it is larger than the sum of its proper divisors (267986949).

647670651 is a wasteful number, since it uses less digits than its factorization.

647670651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83098.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 647670651 is about 25449.3742752155. The cubic root of 647670651 is about 865.2031113355.

The spelling of 647670651 in words is "six hundred forty-seven million, six hundred seventy thousand, six hundred fifty-one".