81057782588 has 12 divisors (see below), whose sum is σ = 144176548152. Its totient is φ = 39864483120.

The previous prime is 81057782551. The next prime is 81057782621. The reversal of 81057782588 is 88528775018.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166101770 + ... + 166102257.

It is an arithmetic number, because the mean of its divisors is an integer number (12014712346).

Almost surely, 2^81057782588 is an apocalyptic number.

It is an amenable number.

81057782588 is a deficient number, since it is larger than the sum of its proper divisors (63118765564).

81057782588 is a wasteful number, since it uses less digits than its factorization.

81057782588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332204092 (or 332204090 counting only the distinct ones).

The product of its (nonzero) digits is 10035200, while the sum is 59.

The spelling of 81057782588 in words is "eighty-one billion, fifty-seven million, seven hundred eighty-two thousand, five hundred eighty-eight".