399665511457 has 2 divisors, whose sum is σ = 399665511458. Its totient is φ = 399665511456.

The previous prime is 399665511433. The next prime is 399665511467. The reversal of 399665511457 is 754115566993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 378515335696 + 21150175761 = 615236^2 + 145431^2 .

It is an emirp because it is prime and its reverse (754115566993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399665511457 - 2²⁷ = 399531293729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399665511395 and 399665511404.

It is not a weakly prime, because it can be changed into another prime (399665511467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199832755728 + 199832755729.

It is an arithmetic number, because the mean of its divisors is an integer number (199832755729).

Almost surely, 2^399665511457 is an apocalyptic number.

It is an amenable number.

399665511457 is a deficient number, since it is larger than the sum of its proper divisors (1).

399665511457 is an equidigital number, since it uses as much as digits as its factorization.

399665511457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618000, while the sum is 61.

The spelling of 399665511457 in words is "three hundred ninety-nine billion, six hundred sixty-five million, five hundred eleven thousand, four hundred fifty-seven".