90566172799 has 4 divisors (see below), whose sum is σ = 90568044864. Its totient is φ = 90564300736.

The previous prime is 90566172779. The next prime is 90566172839. The reversal of 90566172799 is 99727166509.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90566172799 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 (90566172779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861487 + ... + 960880.

It is an arithmetic number, because the mean of its divisors is an integer number (22642011216).

Almost surely, 2^90566172799 is an apocalyptic number.

90566172799 is a deficient number, since it is larger than the sum of its proper divisors (1872065).

90566172799 is a wasteful number, since it uses less digits than its factorization.

90566172799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872064.

The product of its (nonzero) digits is 12859560, while the sum is 61.

The spelling of 90566172799 in words is "ninety billion, five hundred sixty-six million, one hundred seventy-two thousand, seven hundred ninety-nine".