81633469396 has 12 divisors (see below), whose sum is σ = 151262016948. Its totient is φ = 38415750272.

The previous prime is 81633469381. The next prime is 81633469399. The reversal of 81633469396 is 69396433618.

It can be written as a sum of positive squares in 2 ways, for example, as 74846016400 + 6787452996 = 273580^2 + 82386^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81633469396.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81633469399) 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, 600246031 + ... + 600246166.

It is an arithmetic number, because the mean of its divisors is an integer number (12605168079).

Almost surely, 2^81633469396 is an apocalyptic number.

It is an amenable number.

81633469396 is a deficient number, since it is larger than the sum of its proper divisors (69628547552).

81633469396 is a wasteful number, since it uses less digits than its factorization.

81633469396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200492218 (or 1200492216 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 58.

The spelling of 81633469396 in words is "eighty-one billion, six hundred thirty-three million, four hundred sixty-nine thousand, three hundred ninety-six".