255638240999 has 2 divisors, whose sum is σ = 255638241000. Its totient is φ = 255638240998.

The previous prime is 255638240989. The next prime is 255638241031. The reversal of 255638240999 is 999042836552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255638240999 - 2²⁸ = 255369805543 is a prime.

It is a super-2 number, since 2×255638240999² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255638240909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127819120499 + 127819120500.

It is an arithmetic number, because the mean of its divisors is an integer number (127819120500).

Almost surely, 2^255638240999 is an apocalyptic number.

255638240999 is a deficient number, since it is larger than the sum of its proper divisors (1).

255638240999 is an equidigital number, since it uses as much as digits as its factorization.

255638240999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41990400, while the sum is 62.

The spelling of 255638240999 in words is "two hundred fifty-five billion, six hundred thirty-eight million, two hundred forty thousand, nine hundred ninety-nine".