681366345 has 16 divisors (see below), whose sum is σ = 1189294272. Its totient is φ = 330359360.

The previous prime is 681366317. The next prime is 681366373. The reversal of 681366345 is 543663186.

It is an interprime number because it is at equal distance from previous prime (681366317) and next prime (681366373).

It is not a de Polignac number, because 681366345 - 2⁵ = 681366313 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 681366297 and 681366306.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2064582 + ... + 2064911.

It is an arithmetic number, because the mean of its divisors is an integer number (74330892).

Almost surely, 2^681366345 is an apocalyptic number.

It is an amenable number.

681366345 is a deficient number, since it is larger than the sum of its proper divisors (507927927).

681366345 is a wasteful number, since it uses less digits than its factorization.

681366345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129512.

The product of its digits is 311040, while the sum is 42.

The square root of 681366345 is about 26102.9949431095. The cubic root of 681366345 is about 879.9545194298.

The spelling of 681366345 in words is "six hundred eighty-one million, three hundred sixty-six thousand, three hundred forty-five".