691068668 has 6 divisors (see below), whose sum is σ = 1209370176. Its totient is φ = 345534332.

The previous prime is 691068641. The next prime is 691068671. The reversal of 691068668 is 866860196.

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 as a sum of consecutive naturals, namely, 86383580 + ... + 86383587.

It is an arithmetic number, because the mean of its divisors is an integer number (201561696).

Almost surely, 2^691068668 is an apocalyptic number.

It is an amenable number.

691068668 is a deficient number, since it is larger than the sum of its proper divisors (518301508).

691068668 is a wasteful number, since it uses less digits than its factorization.

691068668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172767171 (or 172767169 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 691068668 is about 26288.1849506580. The cubic root of 691068668 is about 884.1115571423. Note that the first 3 decimals are identical.

The spelling of 691068668 in words is "six hundred ninety-one million, sixty-eight thousand, six hundred sixty-eight".