81674945412 has 96 divisors (see below), whose sum is σ = 204348856320. Its totient is φ = 25342584960.

The previous prime is 81674945389. The next prime is 81674945423. The reversal of 81674945412 is 21454947618.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1058587 + ... + 1133117.

It is an arithmetic number, because the mean of its divisors is an integer number (2128633920).

Almost surely, 2^81674945412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81674945412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102174428160).

81674945412 is an abundant number, since it is smaller than the sum of its proper divisors (122673910908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81674945412 is a wasteful number, since it uses less digits than its factorization.

81674945412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74681 (or 74679 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The spelling of 81674945412 in words is "eighty-one billion, six hundred seventy-four million, nine hundred forty-five thousand, four hundred twelve".