82663681 has 8 divisors (see below), whose sum is σ = 83814624. Its totient is φ = 81520320.

The previous prime is 82663631. The next prime is 82663697. The reversal of 82663681 is 18636628.

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-82663681 is a prime.

It is a super-2 number, since 2×82663681² = 13666568312939522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82663631) 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, 22110 + ... + 25576.

It is an arithmetic number, because the mean of its divisors is an integer number (10476828).

Almost surely, 2^82663681 is an apocalyptic number.

It is an amenable number.

82663681 is a deficient number, since it is larger than the sum of its proper divisors (1150943).

82663681 is a wasteful number, since it uses less digits than its factorization.

82663681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791.

The product of its digits is 82944, while the sum is 40.

The square root of 82663681 is about 9091.9569400652. The cubic root of 82663681 is about 435.6170939614.

The spelling of 82663681 in words is "eighty-two million, six hundred sixty-three thousand, six hundred eighty-one".