691366188957 has 8 divisors (see below), whose sum is σ = 930278664480. Its totient is φ = 456682253040.

The previous prime is 691366188923. The next prime is 691366188959. The reversal of 691366188957 is 759881663196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 691366188957 - 2⁸ = 691366188701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691366188891 and 691366188900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691366188959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1057134519 + ... + 1057135172.

It is an arithmetic number, because the mean of its divisors is an integer number (116284833060).

Almost surely, 2^691366188957 is an apocalyptic number.

It is an amenable number.

691366188957 is a deficient number, since it is larger than the sum of its proper divisors (238912475523).

691366188957 is a wasteful number, since it uses less digits than its factorization.

691366188957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114269803.

The product of its digits is 117573120, while the sum is 69.

The spelling of 691366188957 in words is "six hundred ninety-one billion, three hundred sixty-six million, one hundred eighty-eight thousand, nine hundred fifty-seven".