90843638399 has 2 divisors, whose sum is σ = 90843638400. Its totient is φ = 90843638398.

The previous prime is 90843638381. The next prime is 90843638423. The reversal of 90843638399 is 99383634809.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90843638399 - 2¹² = 90843634303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90843638309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45421819199 + 45421819200.

It is an arithmetic number, because the mean of its divisors is an integer number (45421819200).

Almost surely, 2^90843638399 is an apocalyptic number.

90843638399 is a deficient number, since it is larger than the sum of its proper divisors (1).

90843638399 is an equidigital number, since it uses as much as digits as its factorization.

90843638399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30233088, while the sum is 62.

The spelling of 90843638399 in words is "ninety billion, eight hundred forty-three million, six hundred thirty-eight thousand, three hundred ninety-nine".