81025066 has 16 divisors (see below), whose sum is σ = 123638400. Its totient is φ = 39817888.

The previous prime is 81025037. The next prime is 81025093. The reversal of 81025066 is 66052018.

It is a super-2 number, since 2×81025066² = 13130122640608712, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30591 + ... + 33133.

It is an arithmetic number, because the mean of its divisors is an integer number (7727400).

Almost surely, 2^81025066 is an apocalyptic number.

81025066 is a deficient number, since it is larger than the sum of its proper divisors (42613334).

81025066 is a wasteful number, since it uses less digits than its factorization.

81025066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 81025066 is about 9001.3924478383. The cubic root of 81025066 is about 432.7194978814.

The spelling of 81025066 in words is "eighty-one million, twenty-five thousand, sixty-six".