2681663 has 2 divisors, whose sum is σ = 2681664. Its totient is φ = 2681662.

The previous prime is 2681617. The next prime is 2681681. The reversal of 2681663 is 3661862.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2681663 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2681683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340831 + 1340832.

It is an arithmetic number, because the mean of its divisors is an integer number (1340832).

2^2681663 is an apocalyptic number.

2681663 is a deficient number, since it is larger than the sum of its proper divisors (1).

2681663 is an equidigital number, since it uses as much as digits as its factorization.

2681663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 2681663 is about 1637.5783950700. The cubic root of 2681663 is about 138.9317160253.

The spelling of 2681663 in words is "two million, six hundred eighty-one thousand, six hundred sixty-three".