90193238506993 has 4 divisors (see below), whose sum is σ = 90228594541888. Its totient is φ = 90157882472100.

The previous prime is 90193238506979. The next prime is 90193238507033. The reversal of 90193238506993 is 39960583239109.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90193238506993 - 2¹⁷ = 90193238375921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90193238506933) 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, 17678013621 + ... + 17678018722.

It is an arithmetic number, because the mean of its divisors is an integer number (22557148635472).

Almost surely, 2^{90193238506993} is an apocalyptic number.

It is an amenable number.

90193238506993 is a deficient number, since it is larger than the sum of its proper divisors (35356034895).

90193238506993 is a wasteful number, since it uses less digits than its factorization.

90193238506993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35356034894.

The product of its (nonzero) digits is 85030560, while the sum is 67.

The spelling of 90193238506993 in words is "ninety trillion, one hundred ninety-three billion, two hundred thirty-eight million, five hundred six thousand, nine hundred ninety-three".