638580752651 has 2 divisors, whose sum is σ = 638580752652. Its totient is φ = 638580752650.

The previous prime is 638580752647. The next prime is 638580752683. The reversal of 638580752651 is 156257085836.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638580752651 - 2² = 638580752647 is a prime.

It is not a weakly prime, because it can be changed into another prime (638580755651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319290376325 + 319290376326.

It is an arithmetic number, because the mean of its divisors is an integer number (319290376326).

Almost surely, 2^638580752651 is an apocalyptic number.

638580752651 is a deficient number, since it is larger than the sum of its proper divisors (1).

638580752651 is an equidigital number, since it uses as much as digits as its factorization.

638580752651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096000, while the sum is 56.

The spelling of 638580752651 in words is "six hundred thirty-eight billion, five hundred eighty million, seven hundred fifty-two thousand, six hundred fifty-one".