90858779579 has 2 divisors, whose sum is σ = 90858779580. Its totient is φ = 90858779578.

The previous prime is 90858779573. The next prime is 90858779593. The reversal of 90858779579 is 97597785809.

It is a weak prime.

It is an emirp because it is prime and its reverse (97597785809) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90858779579 is a prime.

It is not a weakly prime, because it can be changed into another prime (90858779573) 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, 45429389789 + 45429389790.

It is an arithmetic number, because the mean of its divisors is an integer number (45429389790).

Almost surely, 2^90858779579 is an apocalyptic number.

90858779579 is a deficient number, since it is larger than the sum of its proper divisors (1).

90858779579 is an equidigital number, since it uses as much as digits as its factorization.

90858779579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400075200, while the sum is 74.

The spelling of 90858779579 in words is "ninety billion, eight hundred fifty-eight million, seven hundred seventy-nine thousand, five hundred seventy-nine".