81038385045 has 48 divisors (see below), whose sum is σ = 142673611392. Its totient is φ = 42542375040.

The previous prime is 81038385041. The next prime is 81038385047. The reversal of 81038385045 is 54058383018.

81038385045 is a `hidden beast` number, since 8 + 103 + 8 + 38 + 504 + 5 = 666.

It is not a de Polignac number, because 81038385045 - 2² = 81038385041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81038385041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4153984 + ... + 4173446.

It is an arithmetic number, because the mean of its divisors is an integer number (2972366904).

Almost surely, 2^81038385045 is an apocalyptic number.

It is an amenable number.

81038385045 is a deficient number, since it is larger than the sum of its proper divisors (61635226347).

81038385045 is a wasteful number, since it uses less digits than its factorization.

81038385045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20922 (or 20919 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 81038385045 in words is "eighty-one billion, thirty-eight million, three hundred eighty-five thousand, forty-five".