90918746623 has 4 divisors (see below), whose sum is σ = 91008499608. Its totient is φ = 90828993640.

The previous prime is 90918746621. The next prime is 90918746641. The reversal of 90918746623 is 32664781909.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90918746623 - 2¹ = 90918746621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90918746621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44874973 + ... + 44876998.

It is an arithmetic number, because the mean of its divisors is an integer number (22752124902).

Almost surely, 2^90918746623 is an apocalyptic number.

90918746623 is a deficient number, since it is larger than the sum of its proper divisors (89752985).

90918746623 is a wasteful number, since it uses less digits than its factorization.

90918746623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89752984.

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 90918746623 in words is "ninety billion, nine hundred eighteen million, seven hundred forty-six thousand, six hundred twenty-three".