81574304115 has 32 divisors (see below), whose sum is σ = 134819500032. Its totient is φ = 42074640000.

The previous prime is 81574304101. The next prime is 81574304117. The reversal of 81574304115 is 51140347518.

It is not a de Polignac number, because 81574304115 - 2²⁶ = 81507195251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81574304117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 644565 + ... + 760665.

It is an arithmetic number, because the mean of its divisors is an integer number (4213109376).

Almost surely, 2^81574304115 is an apocalyptic number.

81574304115 is a deficient number, since it is larger than the sum of its proper divisors (53245195917).

81574304115 is a wasteful number, since it uses less digits than its factorization.

81574304115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117651.

The product of its (nonzero) digits is 67200, while the sum is 39.

The spelling of 81574304115 in words is "eighty-one billion, five hundred seventy-four million, three hundred four thousand, one hundred fifteen".