90645666158 has 4 divisors (see below), whose sum is σ = 135968499240. Its totient is φ = 45322833078.

The previous prime is 90645666151. The next prime is 90645666161. The reversal of 90645666158 is 85166654609.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90645666151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22661416538 + ... + 22661416541.

It is an arithmetic number, because the mean of its divisors is an integer number (33992124810).

Almost surely, 2^90645666158 is an apocalyptic number.

90645666158 is a deficient number, since it is larger than the sum of its proper divisors (45322833082).

90645666158 is a wasteful number, since it uses less digits than its factorization.

90645666158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45322833081.

The product of its (nonzero) digits is 9331200, while the sum is 56.

The spelling of 90645666158 in words is "ninety billion, six hundred forty-five million, six hundred sixty-six thousand, one hundred fifty-eight".