81325760051 has 4 divisors (see below), whose sum is σ = 81327651504. Its totient is φ = 81323868600.

The previous prime is 81325759997. The next prime is 81325760069. The reversal of 81325760051 is 15006752318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15006752318 = 2 ⋅7503376159.

It is a cyclic number.

It is not a de Polignac number, because 81325760051 - 2²² = 81321565747 is a prime.

It is a super-2 number, since 2×81325760051² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81325759987 and 81325760014.

It is not an unprimeable number, because it can be changed into a prime (81325760071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879695 + ... + 967736.

It is an arithmetic number, because the mean of its divisors is an integer number (20331912876).

Almost surely, 2^81325760051 is an apocalyptic number.

81325760051 is a deficient number, since it is larger than the sum of its proper divisors (1891453).

81325760051 is a wasteful number, since it uses less digits than its factorization.

81325760051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891452.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 81325760051 in words is "eighty-one billion, three hundred twenty-five million, seven hundred sixty thousand, fifty-one".