90259999867 has 2 divisors, whose sum is σ = 90259999868. Its totient is φ = 90259999866.

The previous prime is 90259999831. The next prime is 90259999873. The reversal of 90259999867 is 76899995209.

It is a strong prime.

It is an emirp because it is prime and its reverse (76899995209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90259999867 - 2³⁵ = 55900261499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90259999867.

It is not a weakly prime, because it can be changed into another prime (90259999367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45129999933 + 45129999934.

It is an arithmetic number, because the mean of its divisors is an integer number (45129999934).

Almost surely, 2^90259999867 is an apocalyptic number.

90259999867 is a deficient number, since it is larger than the sum of its proper divisors (1).

90259999867 is an equidigital number, since it uses as much as digits as its factorization.

90259999867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 198404640, while the sum is 73.

The spelling of 90259999867 in words is "ninety billion, two hundred fifty-nine million, nine hundred ninety-nine thousand, eight hundred sixty-seven".