81466761 has 8 divisors (see below), whose sum is σ = 108972864. Its totient is φ = 54135920.

The previous prime is 81466757. The next prime is 81466769. The reversal of 81466761 is 16766418.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81466761 - 2² = 81466757 is a prime.

It is a super-2 number, since 2×81466761² = 13273666295662242, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81466769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42726 + ... + 44591.

It is an arithmetic number, because the mean of its divisors is an integer number (13621608).

Almost surely, 2^81466761 is an apocalyptic number.

It is an amenable number.

81466761 is a deficient number, since it is larger than the sum of its proper divisors (27506103).

81466761 is a wasteful number, since it uses less digits than its factorization.

81466761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87631.

The product of its digits is 48384, while the sum is 39.

The square root of 81466761 is about 9025.8939169481. The cubic root of 81466761 is about 433.5043734401.

The spelling of 81466761 in words is "eighty-one million, four hundred sixty-six thousand, seven hundred sixty-one".