81582244684 has 24 divisors (see below), whose sum is σ = 148051143968. Its totient is φ = 39303325440.

The previous prime is 81582244651. The next prime is 81582244753. The reversal of 81582244684 is 48644228518.

It is a happy 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, 2660637 + ... + 2691124.

Almost surely, 2^81582244684 is an apocalyptic number.

It is an amenable number.

81582244684 is a deficient number, since it is larger than the sum of its proper divisors (66468899284).

81582244684 is a wasteful number, since it uses less digits than its factorization.

81582244684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5351905 (or 5351903 counting only the distinct ones).

The product of its digits is 3932160, while the sum is 52.

The spelling of 81582244684 in words is "eighty-one billion, five hundred eighty-two million, two hundred forty-four thousand, six hundred eighty-four".