81601534384 has 40 divisors (see below), whose sum is σ = 159738168960. Its totient is φ = 40379136000.

The previous prime is 81601534363. The next prime is 81601534387. The reversal of 81601534384 is 48343510618.

It is a self number, because there is not a number n which added to its sum of digits gives 81601534384.

It is not an unprimeable number, because it can be changed into a prime (81601534387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4177312 + ... + 4196800.

It is an arithmetic number, because the mean of its divisors is an integer number (3993454224).

Almost surely, 2^81601534384 is an apocalyptic number.

It is an amenable number.

81601534384 is a deficient number, since it is larger than the sum of its proper divisors (78136634576).

81601534384 is a wasteful number, since it uses less digits than its factorization.

81601534384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22189 (or 22183 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 81601534384 in words is "eighty-one billion, six hundred one million, five hundred thirty-four thousand, three hundred eighty-four".