638192853601 has 2 divisors, whose sum is σ = 638192853602. Its totient is φ = 638192853600.

The previous prime is 638192853587. The next prime is 638192853643. The reversal of 638192853601 is 106358291836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 590722902225 + 47469951376 = 768585^2 + 217876^2 .

It is a cyclic number.

It is not a de Polignac number, because 638192853601 - 2⁵ = 638192853569 is a prime.

It is not a weakly prime, because it can be changed into another prime (638192853101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319096426800 + 319096426801.

It is an arithmetic number, because the mean of its divisors is an integer number (319096426801).

Almost surely, 2^638192853601 is an apocalyptic number.

It is an amenable number.

638192853601 is a deficient number, since it is larger than the sum of its proper divisors (1).

638192853601 is an equidigital number, since it uses as much as digits as its factorization.

638192853601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 638192853601 in words is "six hundred thirty-eight billion, one hundred ninety-two million, eight hundred fifty-three thousand, six hundred one".