81065356 has 24 divisors (see below), whose sum is σ = 143769920. Its totient is φ = 39992400.

The previous prime is 81065329. The next prime is 81065357. The reversal of 81065356 is 65356018.

It is not an unprimeable number, because it can be changed into a prime (81065357) 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, 116971 + ... + 117661.

Almost surely, 2^81065356 is an apocalyptic number.

It is an amenable number.

81065356 is a deficient number, since it is larger than the sum of its proper divisors (62704564).

81065356 is a wasteful number, since it uses less digits than its factorization.

81065356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 81065356 is about 9003.6301567757. The cubic root of 81065356 is about 432.7912097622.

It can be divided in two parts, 810 and 65356, that added together give a palindrome (66166).

The spelling of 81065356 in words is "eighty-one million, sixty-five thousand, three hundred fifty-six".