681563803 has 4 divisors (see below), whose sum is σ = 697414168. Its totient is φ = 665713440.

The previous prime is 681563783. The next prime is 681563809. The reversal of 681563803 is 308365186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681563803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681563809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7925118 + ... + 7925203.

It is an arithmetic number, because the mean of its divisors is an integer number (174353542).

Almost surely, 2^681563803 is an apocalyptic number.

681563803 is a deficient number, since it is larger than the sum of its proper divisors (15850365).

681563803 is a wasteful number, since it uses less digits than its factorization.

681563803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15850364.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 681563803 is about 26106.7769554191. The cubic root of 681563803 is about 880.0395139798.

The spelling of 681563803 in words is "six hundred eighty-one million, five hundred sixty-three thousand, eight hundred three".