681958766 has 16 divisors (see below), whose sum is σ = 1053977424. Its totient is φ = 330692544.

The previous prime is 681958759. The next prime is 681958787. The reversal of 681958766 is 667859186.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8441 + ... + 37883.

It is an arithmetic number, because the mean of its divisors is an integer number (65873589).

Almost surely, 2^681958766 is an apocalyptic number.

681958766 is a deficient number, since it is larger than the sum of its proper divisors (372018658).

681958766 is a wasteful number, since it uses less digits than its factorization.

681958766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29795.

The product of its digits is 4354560, while the sum is 56.

The square root of 681958766 is about 26114.3402367358. The cubic root of 681958766 is about 880.2094740656.

The spelling of 681958766 in words is "six hundred eighty-one million, nine hundred fifty-eight thousand, seven hundred sixty-six".