81674243436 has 12 divisors (see below), whose sum is σ = 190573234712. Its totient is φ = 27224747808.

The previous prime is 81674243423. The next prime is 81674243459. The reversal of 81674243436 is 63434247618.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3403093465 + ... + 3403093488.

Almost surely, 2^81674243436 is an apocalyptic number.

It is an amenable number.

81674243436 is an abundant number, since it is smaller than the sum of its proper divisors (108898991276).

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

81674243436 is a wasteful number, since it uses less digits than its factorization.

81674243436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6806186960 (or 6806186958 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 48.

The spelling of 81674243436 in words is "eighty-one billion, six hundred seventy-four million, two hundred forty-three thousand, four hundred thirty-six".