81799066 has 8 divisors (see below), whose sum is σ = 129156480. Its totient is φ = 38746908.

The previous prime is 81799043. The next prime is 81799079. The reversal of 81799066 is 66099718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076266 + ... + 1076341.

It is an arithmetic number, because the mean of its divisors is an integer number (16144560).

Almost surely, 2^81799066 is an apocalyptic number.

81799066 is a deficient number, since it is larger than the sum of its proper divisors (47357414).

81799066 is a wasteful number, since it uses less digits than its factorization.

81799066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152628.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 81799066 is about 9044.2836089986. The cubic root of 81799066 is about 434.0929989638.

The spelling of 81799066 in words is "eighty-one million, seven hundred ninety-nine thousand, sixty-six".