681883663 has 4 divisors (see below), whose sum is σ = 682059520. Its totient is φ = 681707808.

The previous prime is 681883633. The next prime is 681883667. The reversal of 681883663 is 366388186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366388186 = 2 ⋅183194093.

It is a cyclic number.

It is not a de Polignac number, because 681883663 - 2¹³ = 681875471 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 (681883667) 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 3 ways as a sum of consecutive naturals, for example, 81978 + ... + 89911.

It is an arithmetic number, because the mean of its divisors is an integer number (170514880).

Almost surely, 2^681883663 is an apocalyptic number.

681883663 is a deficient number, since it is larger than the sum of its proper divisors (175857).

681883663 is a wasteful number, since it uses less digits than its factorization.

681883663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175856.

The product of its digits is 995328, while the sum is 49.

The square root of 681883663 is about 26112.9022324214. The cubic root of 681883663 is about 880.1771608710.

The spelling of 681883663 in words is "six hundred eighty-one million, eight hundred eighty-three thousand, six hundred sixty-three".