81043663 has 8 divisors (see below), whose sum is σ = 81803360. Its totient is φ = 80287200.

The previous prime is 81043657. The next prime is 81043679. The reversal of 81043663 is 36634018.

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 81043663 - 2¹⁷ = 80912591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81043643) 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, 106681 + ... + 107437.

It is an arithmetic number, because the mean of its divisors is an integer number (10225420).

Almost surely, 2^81043663 is an apocalyptic number.

81043663 is a deficient number, since it is larger than the sum of its proper divisors (759697).

81043663 is a wasteful number, since it uses less digits than its factorization.

81043663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 81043663 is about 9002.4253954143. The cubic root of 81043663 is about 432.7526015011.

The spelling of 81043663 in words is "eighty-one million, forty-three thousand, six hundred sixty-three".