81162874900 has 18 divisors (see below), whose sum is σ = 176123438750. Its totient is φ = 32465149920.

The previous prime is 81162874847. The next prime is 81162874939. The reversal of 81162874900 is 947826118.

It can be written as a sum of positive squares in 3 ways, for example, as 26398450576 + 54764424324 = 162476^2 + 234018^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 405814275 + ... + 405814474.

Almost surely, 2^81162874900 is an apocalyptic number.

It is an amenable number.

81162874900 is an abundant number, since it is smaller than the sum of its proper divisors (94960563850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81162874900 is a wasteful number, since it uses less digits than its factorization.

81162874900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811628763 (or 811628756 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 81162874900 in words is "eighty-one billion, one hundred sixty-two million, eight hundred seventy-four thousand, nine hundred".