81510712053 has 8 divisors (see below), whose sum is σ = 109756998816. Its totient is φ = 53802450000.

The previous prime is 81510712051. The next prime is 81510712057. The reversal of 81510712053 is 35021701518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81510712053 - 2¹ = 81510712051 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81510712051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134505823 + ... + 134506428.

It is an arithmetic number, because the mean of its divisors is an integer number (13719624852).

Almost surely, 2^81510712053 is an apocalyptic number.

It is an amenable number.

81510712053 is a deficient number, since it is larger than the sum of its proper divisors (28246286763).

81510712053 is a wasteful number, since it uses less digits than its factorization.

81510712053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269012355.

The product of its (nonzero) digits is 8400, while the sum is 33.

The spelling of 81510712053 in words is "eighty-one billion, five hundred ten million, seven hundred twelve thousand, fifty-three".