81015427204 has 12 divisors (see below), whose sum is σ = 141796451664. Its totient is φ = 40502155304.

The previous prime is 81015427201. The next prime is 81015427231. The reversal of 81015427204 is 40272451018.

It is a self number, because there is not a number n which added to its sum of digits gives 81015427204.

It is not an unprimeable number, because it can be changed into a prime (81015427201) 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, 1356694 + ... + 1415149.

It is an arithmetic number, because the mean of its divisors is an integer number (11816370972).

Almost surely, 2^81015427204 is an apocalyptic number.

It is an amenable number.

81015427204 is a deficient number, since it is larger than the sum of its proper divisors (60781024460).

81015427204 is a wasteful number, since it uses less digits than its factorization.

81015427204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779154 (or 2779152 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The spelling of 81015427204 in words is "eighty-one billion, fifteen million, four hundred twenty-seven thousand, two hundred four".