399554069996639 has 2 divisors, whose sum is σ = 399554069996640. Its totient is φ = 399554069996638.

The previous prime is 399554069996567. The next prime is 399554069996651. The reversal of 399554069996639 is 936699960455993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399554069996639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399554069996539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199777034998319 + 199777034998320.

It is an arithmetic number, because the mean of its divisors is an integer number (199777034998320).

Almost surely, 2^{399554069996639} is an apocalyptic number.

399554069996639 is a deficient number, since it is larger than the sum of its proper divisors (1).

399554069996639 is an equidigital number, since it uses as much as digits as its factorization.

399554069996639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103312130400, while the sum is 92.

The spelling of 399554069996639 in words is "three hundred ninety-nine trillion, five hundred fifty-four billion, sixty-nine million, nine hundred ninety-six thousand, six hundred thirty-nine".