691564945214 has 32 divisors (see below), whose sum is σ = 1220364853344. Its totient is φ = 289771159680.

The previous prime is 691564945213. The next prime is 691564945223. The reversal of 691564945214 is 412549465196.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 691564945214.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691564945213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1439789 + ... + 1859064.

It is an arithmetic number, because the mean of its divisors is an integer number (38136401667).

Almost surely, 2^691564945214 is an apocalyptic number.

691564945214 is a deficient number, since it is larger than the sum of its proper divisors (528799908130).

691564945214 is a wasteful number, since it uses less digits than its factorization.

691564945214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3299612.

The product of its digits is 9331200, while the sum is 56.

The spelling of 691564945214 in words is "six hundred ninety-one billion, five hundred sixty-four million, nine hundred forty-five thousand, two hundred fourteen".