638101804890041 has 2 divisors, whose sum is σ = 638101804890042. Its totient is φ = 638101804890040.

The previous prime is 638101804890007. The next prime is 638101804890047. The reversal of 638101804890041 is 140098408101836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 516936836700025 + 121164968190016 = 22736245^2 + 11007496^2 .

It is a cyclic number.

It is not a de Polignac number, because 638101804890041 - 2³⁸ = 637826926983097 is a prime.

It is not a weakly prime, because it can be changed into another prime (638101804890047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319050902445020 + 319050902445021.

It is an arithmetic number, because the mean of its divisors is an integer number (319050902445021).

Almost surely, 2^{638101804890041} is an apocalyptic number.

It is an amenable number.

638101804890041 is a deficient number, since it is larger than the sum of its proper divisors (1).

638101804890041 is an equidigital number, since it uses as much as digits as its factorization.

638101804890041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1327104, while the sum is 53.

The spelling of 638101804890041 in words is "six hundred thirty-eight trillion, one hundred one billion, eight hundred four million, eight hundred ninety thousand, forty-one".