81451232546 has 16 divisors (see below), whose sum is σ = 124016393184. Its totient is φ = 40112591904.

The previous prime is 81451232543. The next prime is 81451232579. The reversal of 81451232546 is 64523215418.

It is not an unprimeable number, because it can be changed into a prime (81451232543) 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, 1132661 + ... + 1202423.

It is an arithmetic number, because the mean of its divisors is an integer number (7751024574).

Almost surely, 2^81451232546 is an apocalyptic number.

81451232546 is a deficient number, since it is larger than the sum of its proper divisors (42565160638).

81451232546 is a wasteful number, since it uses less digits than its factorization.

81451232546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78545.

The product of its digits is 230400, while the sum is 41.

The spelling of 81451232546 in words is "eighty-one billion, four hundred fifty-one million, two hundred thirty-two thousand, five hundred forty-six".