681663107 has 8 divisors (see below), whose sum is σ = 684868800. Its totient is φ = 678464424.

The previous prime is 681663053. The next prime is 681663131. The reversal of 681663107 is 701366186.

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

It is a cyclic number.

It is not a de Polignac number, because 681663107 - 2⁸ = 681662851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681663187) 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, 311744 + ... + 313922.

It is an arithmetic number, because the mean of its divisors is an integer number (85608600).

Almost surely, 2^681663107 is an apocalyptic number.

681663107 is a deficient number, since it is larger than the sum of its proper divisors (3205693).

681663107 is a wasteful number, since it uses less digits than its factorization.

681663107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3505.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 681663107 is about 26108.6787677967. The cubic root of 681663107 is about 880.0822525562.

The spelling of 681663107 in words is "six hundred eighty-one million, six hundred sixty-three thousand, one hundred seven".