81375689804 has 12 divisors (see below), whose sum is σ = 142731850800. Its totient is φ = 40595161008.

The previous prime is 81375689797. The next prime is 81375689809. The reversal of 81375689804 is 40898657318.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81375689809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23168999 + ... + 23172510.

It is an arithmetic number, because the mean of its divisors is an integer number (11894320900).

Almost surely, 2^81375689804 is an apocalyptic number.

It is an amenable number.

81375689804 is a deficient number, since it is larger than the sum of its proper divisors (61356160996).

81375689804 is a wasteful number, since it uses less digits than its factorization.

81375689804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46341952 (or 46341950 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 81375689804 in words is "eighty-one billion, three hundred seventy-five million, six hundred eighty-nine thousand, eight hundred four".