81124656052 has 12 divisors (see below), whose sum is σ = 154874343456. Its totient is φ = 36874843640.

The previous prime is 81124656049. The next prime is 81124656077. The reversal of 81124656052 is 25065642118.

It is a junction number, because it is equal to n+sod(n) for n = 81124655996 and 81124656014.

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, 921871048 + ... + 921871135.

It is an arithmetic number, because the mean of its divisors is an integer number (12906195288).

Almost surely, 2^81124656052 is an apocalyptic number.

It is an amenable number.

81124656052 is a deficient number, since it is larger than the sum of its proper divisors (73749687404).

81124656052 is a wasteful number, since it uses less digits than its factorization.

81124656052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843742198 (or 1843742196 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 81124656052 in words is "eighty-one billion, one hundred twenty-four million, six hundred fifty-six thousand, fifty-two".