81352133125318 has 32 divisors (see below), whose sum is σ = 140142168000000. Its totient is φ = 35028496098720.

The previous prime is 81352133125313. The next prime is 81352133125343.

It is a happy number.

81352133125318 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81352133125318² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81352133125313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5622318 + ... + 13939681.

It is an arithmetic number, because the mean of its divisors is an integer number (4379442750000).

Almost surely, 2^{81352133125318} is an apocalyptic number.

81352133125318 is a deficient number, since it is larger than the sum of its proper divisors (58790034874682).

81352133125318 is a wasteful number, since it uses less digits than its factorization.

81352133125318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19571980.

The product of its digits is 518400, while the sum is 46.

The spelling of 81352133125318 in words is "eighty-one trillion, three hundred fifty-two billion, one hundred thirty-three million, one hundred twenty-five thousand, three hundred eighteen".