695813661 has 6 divisors (see below), whose sum is σ = 1005064190. Its totient is φ = 463875768.

The previous prime is 695813623. The next prime is 695813669. The reversal of 695813661 is 166318596.

695813661 is a `hidden beast` number, since 6 + 9 + 581 + 3 + 6 + 61 = 666.

695813661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 515744100 + 180069561 = 22710^2 + 13419^2 .

It is not a de Polignac number, because 695813661 - 2⁶ = 695813597 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 (695813669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38656306 + ... + 38656323.

Almost surely, 2^695813661 is an apocalyptic number.

It is an amenable number.

695813661 is a deficient number, since it is larger than the sum of its proper divisors (309250529).

695813661 is a wasteful number, since it uses less digits than its factorization.

695813661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77312635 (or 77312632 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 695813661 is about 26378.2800993545. The cubic root of 695813661 is about 886.1304294461.

The spelling of 695813661 in words is "six hundred ninety-five million, eight hundred thirteen thousand, six hundred sixty-one".