81875663 has 8 divisors (see below), whose sum is σ = 82945632. Its totient is φ = 80810496.

The previous prime is 81875641. The next prime is 81875669. The reversal of 81875663 is 36657818.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81875663 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 (81875669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43406 + ... + 45252.

It is an arithmetic number, because the mean of its divisors is an integer number (10368204).

Almost surely, 2^81875663 is an apocalyptic number.

81875663 is a deficient number, since it is larger than the sum of its proper divisors (1069969).

81875663 is a wasteful number, since it uses less digits than its factorization.

81875663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401.

The product of its digits is 241920, while the sum is 44.

The square root of 81875663 is about 9048.5171713381. The cubic root of 81875663 is about 434.2284522149.

The spelling of 81875663 in words is "eighty-one million, eight hundred seventy-five thousand, six hundred sixty-three".