400865659499 has 2 divisors, whose sum is σ = 400865659500. Its totient is φ = 400865659498.

The previous prime is 400865659483. The next prime is 400865659561. The reversal of 400865659499 is 994956568004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400865659499 - 2⁴ = 400865659483 is a prime.

It is not a weakly prime, because it can be changed into another prime (400865659409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200432829749 + 200432829750.

It is an arithmetic number, because the mean of its divisors is an integer number (200432829750).

Almost surely, 2^400865659499 is an apocalyptic number.

400865659499 is a deficient number, since it is larger than the sum of its proper divisors (1).

400865659499 is an equidigital number, since it uses as much as digits as its factorization.

400865659499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 83980800, while the sum is 65.

The spelling of 400865659499 in words is "four hundred billion, eight hundred sixty-five million, six hundred fifty-nine thousand, four hundred ninety-nine".