90947163579 has 4 divisors (see below), whose sum is σ = 121262884776. Its totient is φ = 60631442384.

The previous prime is 90947163557. The next prime is 90947163641. The reversal of 90947163579 is 97536174909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97536174909 = 3 ⋅32512058303.

It is a cyclic number.

It is not a de Polignac number, because 90947163579 - 2¹² = 90947159483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90947163509) 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 in 3 ways as a sum of consecutive naturals, for example, 15157860594 + ... + 15157860599.

It is an arithmetic number, because the mean of its divisors is an integer number (30315721194).

Almost surely, 2^90947163579 is an apocalyptic number.

90947163579 is a deficient number, since it is larger than the sum of its proper divisors (30315721197).

90947163579 is a wasteful number, since it uses less digits than its factorization.

90947163579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30315721196.

The product of its (nonzero) digits is 12859560, while the sum is 60.

The spelling of 90947163579 in words is "ninety billion, nine hundred forty-seven million, one hundred sixty-three thousand, five hundred seventy-nine".