90858195677 has 4 divisors (see below), whose sum is σ = 91662250620. Its totient is φ = 90054140736.

The previous prime is 90858195671. The next prime is 90858195679. The reversal of 90858195677 is 77659185809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77659185809 = 7727 ⋅10050367.

It can be written as a sum of positive squares in 2 ways, for example, as 9512881156 + 81345314521 = 97534^2 + 285211^2 .

It is a cyclic number.

It is not a de Polignac number, because 90858195677 - 2⁴ = 90858195661 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 (90858195671) 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, 402027302 + ... + 402027527.

It is an arithmetic number, because the mean of its divisors is an integer number (22915562655).

Almost surely, 2^90858195677 is an apocalyptic number.

It is an amenable number.

90858195677 is a deficient number, since it is larger than the sum of its proper divisors (804054943).

90858195677 is a wasteful number, since it uses less digits than its factorization.

90858195677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804054942.

The product of its (nonzero) digits is 38102400, while the sum is 65.

The spelling of 90858195677 in words is "ninety billion, eight hundred fifty-eight million, one hundred ninety-five thousand, six hundred seventy-seven".