398166387733 has 2 divisors, whose sum is σ = 398166387734. Its totient is φ = 398166387732.

The previous prime is 398166387721. The next prime is 398166387799. The reversal of 398166387733 is 337783661893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 353017787409 + 45148600324 = 594153^2 + 212482^2 .

It is a cyclic number.

It is not a de Polignac number, because 398166387733 - 2⁵ = 398166387701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398166381733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199083193866 + 199083193867.

It is an arithmetic number, because the mean of its divisors is an integer number (199083193867).

Almost surely, 2^398166387733 is an apocalyptic number.

It is an amenable number.

398166387733 is a deficient number, since it is larger than the sum of its proper divisors (1).

398166387733 is an equidigital number, since it uses as much as digits as its factorization.

398166387733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82301184, while the sum is 64.

The spelling of 398166387733 in words is "three hundred ninety-eight billion, one hundred sixty-six million, three hundred eighty-seven thousand, seven hundred thirty-three".