81115145170 has 32 divisors (see below), whose sum is σ = 147752661168. Its totient is φ = 32059281408.

The previous prime is 81115145147. The next prime is 81115145179. The reversal of 81115145170 is 7154151118.

It can be written as a sum of positive squares in 8 ways, for example, as 25214581681 + 55900563489 = 158791^2 + 236433^2 .

It is not an unprimeable number, because it can be changed into a prime (81115145179) 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, 530724 + ... + 666256.

Almost surely, 2^81115145170 is an apocalyptic number.

81115145170 is a deficient number, since it is larger than the sum of its proper divisors (66637515998).

81115145170 is a wasteful number, since it uses less digits than its factorization.

81115145170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136254.

The product of its (nonzero) digits is 5600, while the sum is 34.

Adding to 81115145170 its reverse (7154151118), we get a palindrome (88269296288).

The spelling of 81115145170 in words is "eighty-one billion, one hundred fifteen million, one hundred forty-five thousand, one hundred seventy".