695868661 has 8 divisors (see below), whose sum is σ = 705115800. Its totient is φ = 686653440.

The previous prime is 695868653. The next prime is 695868697. The reversal of 695868661 is 166868596.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 181440900 + 514427761 = 13470^2 + 22681^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 695868661 - 2³ = 695868653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (695868161) by changing a digit.

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, 37621 + ... + 52981.

It is an arithmetic number, because the mean of its divisors is an integer number (88139475).

Almost surely, 2^695868661 is an apocalyptic number.

It is an amenable number.

695868661 is a deficient number, since it is larger than the sum of its proper divisors (9247139).

695868661 is a wasteful number, since it uses less digits than its factorization.

695868661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15959.

The product of its digits is 3732480, while the sum is 55.

The square root of 695868661 is about 26379.3226031299. The cubic root of 695868661 is about 886.1537766400.

The spelling of 695868661 in words is "six hundred ninety-five million, eight hundred sixty-eight thousand, six hundred sixty-one".