81606944782 has 32 divisors (see below), whose sum is σ = 139677592320. Its totient is φ = 35396507520.

The previous prime is 81606944777. The next prime is 81606944831. The reversal of 81606944782 is 28744960618.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19558 + ... + 404470.

It is an arithmetic number, because the mean of its divisors is an integer number (4364924760).

Almost surely, 2^81606944782 is an apocalyptic number.

81606944782 is a deficient number, since it is larger than the sum of its proper divisors (58070647538).

81606944782 is a wasteful number, since it uses less digits than its factorization.

81606944782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385368.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 81606944782 in words is "eighty-one billion, six hundred six million, nine hundred forty-four thousand, seven hundred eighty-two".