81773345392 has 20 divisors (see below), whose sum is σ = 162717908056. Its totient is φ = 39781627200.

The previous prime is 81773345387. The next prime is 81773345419. The reversal of 81773345392 is 29354337718.

It is a congruent number.

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, 69064734 + ... + 69065917.

Almost surely, 2^81773345392 is an apocalyptic number.

It is an amenable number.

81773345392 is a deficient number, since it is larger than the sum of its proper divisors (80944562664).

81773345392 is a wasteful number, since it uses less digits than its factorization.

81773345392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138130696 (or 138130690 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 52.

The spelling of 81773345392 in words is "eighty-one billion, seven hundred seventy-three million, three hundred forty-five thousand, three hundred ninety-two".