81458280544 has 48 divisors (see below), whose sum is σ = 163030190400. Its totient is φ = 40055773824.

The previous prime is 81458280521. The next prime is 81458280551. The reversal of 81458280544 is 44508285418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296447 + ... + 1357825.

It is an arithmetic number, because the mean of its divisors is an integer number (3396462300).

Almost surely, 2^81458280544 is an apocalyptic number.

It is an amenable number.

81458280544 is an abundant number, since it is smaller than the sum of its proper divisors (81571909856).

81458280544 is a wasteful number, since it uses less digits than its factorization.

81458280544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62075 (or 62067 counting only the distinct ones).

The product of its (nonzero) digits is 1638400, while the sum is 49.

The spelling of 81458280544 in words is "eighty-one billion, four hundred fifty-eight million, two hundred eighty thousand, five hundred forty-four".