81673665782204 has 48 divisors (see below), whose sum is σ = 147835435217568. Its totient is φ = 39451269811968.

The previous prime is 81673665782171. The next prime is 81673665782207. The reversal of 81673665782204 is 40228756637618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81673665782207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17275307 + ... + 21489149.

It is an arithmetic number, because the mean of its divisors is an integer number (3079904900366).

Almost surely, 2^{81673665782204} is an apocalyptic number.

It is an amenable number.

81673665782204 is a deficient number, since it is larger than the sum of its proper divisors (66161769435364).

81673665782204 is a wasteful number, since it uses less digits than its factorization.

81673665782204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4214814 (or 4214812 counting only the distinct ones).

The product of its (nonzero) digits is 162570240, while the sum is 65.

The spelling of 81673665782204 in words is "eighty-one trillion, six hundred seventy-three billion, six hundred sixty-five million, seven hundred eighty-two thousand, two hundred four".