25532816818 has 16 divisors (see below), whose sum is σ = 38597183064. Its totient is φ = 12667472640.

The previous prime is 25532816809. The next prime is 25532816839. The reversal of 25532816818 is 81861823552.

It can be written as a sum of positive squares in 4 ways, for example, as 24353787249 + 1179029569 = 156057^2 + 34337^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37896 + ... + 229132.

Almost surely, 2^25532816818 is an apocalyptic number.

25532816818 is a deficient number, since it is larger than the sum of its proper divisors (13064366246).

25532816818 is a wasteful number, since it uses less digits than its factorization.

25532816818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191757.

The product of its digits is 921600, while the sum is 49.

The spelling of 25532816818 in words is "twenty-five billion, five hundred thirty-two million, eight hundred sixteen thousand, eight hundred eighteen".