81452018404 has 9 divisors (see below), whose sum is σ = 142542031107. Its totient is φ = 40725723804.

The previous prime is 81452018399. The next prime is 81452018407. The reversal of 81452018404 is 40481025418.

The square root of 81452018404 is 285398.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81452018407) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 499447 + ... + 642145.

Almost surely, 2^81452018404 is an apocalyptic number.

81452018404 is the 285398-th square number.

It is an amenable number.

81452018404 is a deficient number, since it is larger than the sum of its proper divisors (61090012703).

81452018404 is an frugal number, since it uses more digits than its factorization.

81452018404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285402 (or 142701 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 37.

The spelling of 81452018404 in words is "eighty-one billion, four hundred fifty-two million, eighteen thousand, four hundred four".