6664742651 has 24 divisors (see below), whose sum is σ = 8118738144. Its totient is φ = 5358182400.

The previous prime is 6664742647. The next prime is 6664742653. The reversal of 6664742651 is 1562474666.

It is not a de Polignac number, because 6664742651 - 2² = 6664742647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6664742596 and 6664742605.

It is not an unprimeable number, because it can be changed into a prime (6664742653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 242171 + ... + 268283.

It is an arithmetic number, because the mean of its divisors is an integer number (338280756).

Almost surely, 2^6664742651 is an apocalyptic number.

6664742651 is a deficient number, since it is larger than the sum of its proper divisors (1453995493).

6664742651 is a wasteful number, since it uses less digits than its factorization.

6664742651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26259 (or 26240 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 47.

The square root of 6664742651 is about 81637.8751009603. The cubic root of 6664742651 is about 1881.8909835352.

The spelling of 6664742651 in words is "six billion, six hundred sixty-four million, seven hundred forty-two thousand, six hundred fifty-one".