90101392618 has 4 divisors (see below), whose sum is σ = 135152088930. Its totient is φ = 45050696308.

The previous prime is 90101392607. The next prime is 90101392637. The reversal of 90101392618 is 81629310109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81629310109 = 11969 ⋅6820061.

It can be written as a sum of positive squares in only one way, i.e., 77705465049 + 12395927569 = 278757^2 + 111337^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22525348153 + ... + 22525348156.

Almost surely, 2^90101392618 is an apocalyptic number.

90101392618 is a deficient number, since it is larger than the sum of its proper divisors (45050696312).

90101392618 is a wasteful number, since it uses less digits than its factorization.

90101392618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45050696311.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 90101392618 in words is "ninety billion, one hundred one million, three hundred ninety-two thousand, six hundred eighteen".