655863998399 has 2 divisors, whose sum is σ = 655863998400. Its totient is φ = 655863998398.

The previous prime is 655863998389. The next prime is 655863998411. The reversal of 655863998399 is 993899368556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655863998399 - 2¹⁶ = 655863932863 is a prime.

It is a super-3 number, since 3×655863998399³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655863998389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327931999199 + 327931999200.

It is an arithmetic number, because the mean of its divisors is an integer number (327931999200).

Almost surely, 2^655863998399 is an apocalyptic number.

655863998399 is a deficient number, since it is larger than the sum of its proper divisors (1).

655863998399 is an equidigital number, since it uses as much as digits as its factorization.

655863998399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3401222400, while the sum is 80.

The spelling of 655863998399 in words is "six hundred fifty-five billion, eight hundred sixty-three million, nine hundred ninety-eight thousand, three hundred ninety-nine".