6638417801 has 2 divisors, whose sum is σ = 6638417802. Its totient is φ = 6638417800.

The previous prime is 6638417783. The next prime is 6638417857. The reversal of 6638417801 is 1087148366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4300211776 + 2338206025 = 65576^2 + 48355^2 .

It is a cyclic number.

It is not a de Polignac number, because 6638417801 - 2¹⁰ = 6638416777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6638407801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319208900 + 3319208901.

It is an arithmetic number, because the mean of its divisors is an integer number (3319208901).

Almost surely, 2^6638417801 is an apocalyptic number.

It is an amenable number.

6638417801 is a deficient number, since it is larger than the sum of its proper divisors (1).

6638417801 is an equidigital number, since it uses as much as digits as its factorization.

6638417801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 6638417801 is about 81476.4861846656. The cubic root of 6638417801 is about 1879.4099741351.

The spelling of 6638417801 in words is "six billion, six hundred thirty-eight million, four hundred seventeen thousand, eight hundred one".