81575204084 has 48 divisors (see below), whose sum is σ = 160195698432. Its totient is φ = 36024960000.

The previous prime is 81575204083. The next prime is 81575204099. The reversal of 81575204084 is 48040257518.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81575204083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340949 + ... + 528579.

It is an arithmetic number, because the mean of its divisors is an integer number (3337410384).

Almost surely, 2^81575204084 is an apocalyptic number.

It is an amenable number.

81575204084 is a deficient number, since it is larger than the sum of its proper divisors (78620494348).

81575204084 is a wasteful number, since it uses less digits than its factorization.

81575204084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187928 (or 187926 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 44.

The spelling of 81575204084 in words is "eighty-one billion, five hundred seventy-five million, two hundred four thousand, eighty-four".