81535044382 has 48 divisors (see below), whose sum is σ = 139104806400. Its totient is φ = 35778877200.

The previous prime is 81535044361. The next prime is 81535044403. The reversal of 81535044382 is 28344053518.

It is an interprime number because it is at equal distance from previous prime (81535044361) and next prime (81535044403).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3130369 + ... + 3156307.

It is an arithmetic number, because the mean of its divisors is an integer number (2898016800).

Almost surely, 2^81535044382 is an apocalyptic number.

81535044382 is a deficient number, since it is larger than the sum of its proper divisors (57569762018).

81535044382 is a wasteful number, since it uses less digits than its factorization.

81535044382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26413 (or 26402 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 43.

The spelling of 81535044382 in words is "eighty-one billion, five hundred thirty-five million, forty-four thousand, three hundred eighty-two".