90493416865 has 4 divisors (see below), whose sum is σ = 108592100244. Its totient is φ = 72394733488.

The previous prime is 90493416863. The next prime is 90493416877. The reversal of 90493416865 is 56861439409.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56861439409 = 257 ⋅221250737.

It can be written as a sum of positive squares in 2 ways, for example, as 15684055696 + 74809361169 = 125236^2 + 273513^2 .

It is a cyclic number.

It is not a de Polignac number, because 90493416865 - 2¹ = 90493416863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90493416863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9049341682 + ... + 9049341691.

It is an arithmetic number, because the mean of its divisors is an integer number (27148025061).

Almost surely, 2^90493416865 is an apocalyptic number.

It is an amenable number.

90493416865 is a deficient number, since it is larger than the sum of its proper divisors (18098683379).

90493416865 is a wasteful number, since it uses less digits than its factorization.

90493416865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18098683378.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 90493416865 in words is "ninety billion, four hundred ninety-three million, four hundred sixteen thousand, eight hundred sixty-five".