81849427776 has 56 divisors (see below), whose sum is σ = 240622165440. Its totient is φ = 27283142016.

The previous prime is 81849427721. The next prime is 81849427843. The reversal of 81849427776 is 67772494818.

81849427776 is a `hidden beast` number, since 8 + 1 + 8 + 494 + 2 + 77 + 76 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23681556 + ... + 23685011.

Almost surely, 2^81849427776 is an apocalyptic number.

It is an amenable number.

81849427776 is an abundant number, since it is smaller than the sum of its proper divisors (158772737664).

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

81849427776 is a wasteful number, since it uses less digits than its factorization.

81849427776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47366588 (or 47366572 counting only the distinct ones).

The product of its digits is 37933056, while the sum is 63.

The spelling of 81849427776 in words is "eighty-one billion, eight hundred forty-nine million, four hundred twenty-seven thousand, seven hundred seventy-six".