681266667 has 4 divisors (see below), whose sum is σ = 908355560. Its totient is φ = 454177776.

The previous prime is 681266659. The next prime is 681266683. The reversal of 681266667 is 766662186.

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

It is not a de Polignac number, because 681266667 - 2³ = 681266659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681266767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113544442 + ... + 113544447.

It is an arithmetic number, because the mean of its divisors is an integer number (227088890).

Almost surely, 2^681266667 is an apocalyptic number.

681266667 is a deficient number, since it is larger than the sum of its proper divisors (227088893).

681266667 is a wasteful number, since it uses less digits than its factorization.

681266667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227088892.

The product of its digits is 870912, while the sum is 48.

The square root of 681266667 is about 26101.0855521375. The cubic root of 681266667 is about 879.9116074267.

The spelling of 681266667 in words is "six hundred eighty-one million, two hundred sixty-six thousand, six hundred sixty-seven".