5518194065 has 4 divisors (see below), whose sum is σ = 6621832884. Its totient is φ = 4414555248.

The previous prime is 5518194043. The next prime is 5518194113. The reversal of 5518194065 is 5604918155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5604918155 = 5 ⋅1120983631.

It can be written as a sum of positive squares in 2 ways, for example, as 1367742289 + 4150451776 = 36983^2 + 64424^2 .

It is a cyclic number.

It is not a de Polignac number, because 5518194065 - 2⁸ = 5518193809 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, 551819402 + ... + 551819411.

It is an arithmetic number, because the mean of its divisors is an integer number (1655458221).

Almost surely, 2^5518194065 is an apocalyptic number.

It is an amenable number.

5518194065 is a deficient number, since it is larger than the sum of its proper divisors (1103638819).

5518194065 is a wasteful number, since it uses less digits than its factorization.

5518194065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103638818.

The product of its (nonzero) digits is 216000, while the sum is 44.

The square root of 5518194065 is about 74284.5479558165. The cubic root of 5518194065 is about 1767.1184310236.

The spelling of 5518194065 in words is "five billion, five hundred eighteen million, one hundred ninety-four thousand, sixty-five".