81265768130224 has 40 divisors (see below), whose sum is σ = 158864390568432. Its totient is φ = 40268590172160.

The previous prime is 81265768130221. The next prime is 81265768130237. The reversal of 81265768130224 is 42203186756218.

It is a happy number.

It is a super-2 number, since 2×81265768130224² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81265768130221) 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, 12857364 + ... + 18106444.

Almost surely, 2^{81265768130224} is an apocalyptic number.

It is an amenable number.

81265768130224 is a deficient number, since it is larger than the sum of its proper divisors (77598622438208).

81265768130224 is a wasteful number, since it uses less digits than its factorization.

81265768130224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257765 (or 5257759 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 55.

The spelling of 81265768130224 in words is "eighty-one trillion, two hundred sixty-five billion, seven hundred sixty-eight million, one hundred thirty thousand, two hundred twenty-four".