6647638723 has 12 divisors (see below), whose sum is σ = 7344025920. Its totient is φ = 6012609680.

The previous prime is 6647638703. The next prime is 6647638757. The reversal of 6647638723 is 3278367466.

It is not a de Polignac number, because 6647638723 - 2⁵ = 6647638691 is a prime.

It is a super-2 number, since 2×6647638723² = 88382201183058141458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6647638703) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 115603 + ... + 163276.

It is an arithmetic number, because the mean of its divisors is an integer number (612002160).

Almost surely, 2^6647638723 is an apocalyptic number.

6647638723 is a deficient number, since it is larger than the sum of its proper divisors (696387197).

6647638723 is a wasteful number, since it uses less digits than its factorization.

6647638723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279098 (or 279087 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 52.

The square root of 6647638723 is about 81533.0529478689. The cubic root of 6647638723 is about 1880.2797534311.

The spelling of 6647638723 in words is "six billion, six hundred forty-seven million, six hundred thirty-eight thousand, seven hundred twenty-three".