691666666196 has 12 divisors (see below), whose sum is σ = 1320454544640. Its totient is φ = 314393939160.

The previous prime is 691666666157. The next prime is 691666666217.

691666666196 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×691666666196² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7859848436 + ... + 7859848523.

It is an arithmetic number, because the mean of its divisors is an integer number (110037878720).

Almost surely, 2^691666666196 is an apocalyptic number.

It is an amenable number.

691666666196 is a deficient number, since it is larger than the sum of its proper divisors (628787878444).

691666666196 is a wasteful number, since it uses less digits than its factorization.

691666666196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15719696974 (or 15719696972 counting only the distinct ones).

The product of its digits is 136048896, while the sum is 68.

The spelling of 691666666196 in words is "six hundred ninety-one billion, six hundred sixty-six million, six hundred sixty-six thousand, one hundred ninety-six".