81053970039 has 12 divisors (see below), whose sum is σ = 133803379216. Its totient is φ = 46316554272.

The previous prime is 81053969993. The next prime is 81053970071. The reversal of 81053970039 is 93007935018.

It is a happy number.

81053970039 is a `hidden beast` number, since 8 + 10 + 539 + 70 + 0 + 39 = 666.

It is not a de Polignac number, because 81053970039 - 2¹¹ = 81053967991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81053969976 and 81053970003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81053970079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 643285414 + ... + 643285539.

Almost surely, 2^81053970039 is an apocalyptic number.

81053970039 is a deficient number, since it is larger than the sum of its proper divisors (52749409177).

81053970039 is a wasteful number, since it uses less digits than its factorization.

81053970039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286570966 (or 1286570963 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 81053970039 in words is "eighty-one billion, fifty-three million, nine hundred seventy thousand, thirty-nine".