81766341 has 48 divisors (see below), whose sum is σ = 130253760. Its totient is φ = 51166080.

The previous prime is 81766327. The next prime is 81766381. The reversal of 81766341 is 14366718.

81766341 is a `hidden beast` number, since 8 + 17 + 6 + 634 + 1 = 666.

It is not a de Polignac number, because 81766341 - 2⁷ = 81766213 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81766296 and 81766305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81766301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 288786 + ... + 289068.

It is an arithmetic number, because the mean of its divisors is an integer number (2713620).

Almost surely, 2^81766341 is an apocalyptic number.

81766341 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

81766341 is a deficient number, since it is larger than the sum of its proper divisors (48487419).

81766341 is a wasteful number, since it uses less digits than its factorization.

81766341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 356 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 81766341 is about 9042.4742742238. The cubic root of 81766341 is about 434.0351026702.

The spelling of 81766341 in words is "eighty-one million, seven hundred sixty-six thousand, three hundred forty-one".