90981026177 has 2 divisors, whose sum is σ = 90981026178. Its totient is φ = 90981026176.

The previous prime is 90981026167. The next prime is 90981026183. The reversal of 90981026177 is 77162018909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77667558721 + 13313467456 = 278689^2 + 115384^2 .

It is a cyclic number.

It is not a de Polignac number, because 90981026177 - 2²⁰ = 90979977601 is a prime.

It is not a weakly prime, because it can be changed into another prime (90981026167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45490513088 + 45490513089.

It is an arithmetic number, because the mean of its divisors is an integer number (45490513089).

Almost surely, 2^90981026177 is an apocalyptic number.

It is an amenable number.

90981026177 is a deficient number, since it is larger than the sum of its proper divisors (1).

90981026177 is an equidigital number, since it uses as much as digits as its factorization.

90981026177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 50.

The spelling of 90981026177 in words is "ninety billion, nine hundred eighty-one million, twenty-six thousand, one hundred seventy-seven".