399336247633 has 2 divisors, whose sum is σ = 399336247634. Its totient is φ = 399336247632.

The previous prime is 399336247621. The next prime is 399336247637. The reversal of 399336247633 is 336742633993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394626445249 + 4709802384 = 628193^2 + 68628^2 .

It is an emirp because it is prime and its reverse (336742633993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399336247633 - 2³⁷ = 261897294161 is a prime.

It is not a weakly prime, because it can be changed into another prime (399336247637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199668123816 + 199668123817.

It is an arithmetic number, because the mean of its divisors is an integer number (199668123817).

Almost surely, 2^399336247633 is an apocalyptic number.

It is an amenable number.

399336247633 is a deficient number, since it is larger than the sum of its proper divisors (1).

399336247633 is an equidigital number, since it uses as much as digits as its factorization.

399336247633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39680928, while the sum is 58.

The spelling of 399336247633 in words is "three hundred ninety-nine billion, three hundred thirty-six million, two hundred forty-seven thousand, six hundred thirty-three".