89400155665 has 4 divisors (see below), whose sum is σ = 107280186804. Its totient is φ = 71520124528.

The previous prime is 89400155653. The next prime is 89400155683. The reversal of 89400155665 is 56655100498.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56655100498 = 2 ⋅28327550249.

It can be written as a sum of positive squares in 2 ways, for example, as 48460298769 + 40939856896 = 220137^2 + 202336^2 .

It is a cyclic number.

It is not a de Polignac number, because 89400155665 - 2²³ = 89391767057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8940015562 + ... + 8940015571.

It is an arithmetic number, because the mean of its divisors is an integer number (26820046701).

Almost surely, 2^89400155665 is an apocalyptic number.

It is an amenable number.

89400155665 is a deficient number, since it is larger than the sum of its proper divisors (17880031139).

89400155665 is a wasteful number, since it uses less digits than its factorization.

89400155665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17880031138.

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 89400155665 in words is "eighty-nine billion, four hundred million, one hundred fifty-five thousand, six hundred sixty-five".