90368776997 has 4 divisors (see below), whose sum is σ = 90502261836. Its totient is φ = 90235292160.

The previous prime is 90368776973. The next prime is 90368777087. The reversal of 90368776997 is 79967786309.

It is a Cunningham number, because it is equal to 300614²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79967786309 = 1097 ⋅72896797.

It can be written as a sum of positive squares in 2 ways, for example, as 89835675076 + 533101921 = 299726^2 + 23089^2 .

It is a cyclic number.

It is not a de Polignac number, because 90368776997 - 2²⁴ = 90351999781 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90368776997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90368776397) 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, 66741404 + ... + 66742757.

It is an arithmetic number, because the mean of its divisors is an integer number (22625565459).

Almost surely, 2^90368776997 is an apocalyptic number.

It is an amenable number.

90368776997 is a deficient number, since it is larger than the sum of its proper divisors (133484839).

90368776997 is a wasteful number, since it uses less digits than its factorization.

90368776997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133484838.

The product of its (nonzero) digits is 216040608, while the sum is 71.

The spelling of 90368776997 in words is "ninety billion, three hundred sixty-eight million, seven hundred seventy-six thousand, nine hundred ninety-seven".