696537665 has 4 divisors (see below), whose sum is σ = 835845204. Its totient is φ = 557230128.

The previous prime is 696537661. The next prime is 696537671. The reversal of 696537665 is 566735696.

It is a Cunningham number, because it is equal to 26392²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 250778896 + 445758769 = 15836^2 + 21113^2 .

It is a cyclic number.

It is not a de Polignac number, because 696537665 - 2² = 696537661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (696537661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69653762 + ... + 69653771.

It is an arithmetic number, because the mean of its divisors is an integer number (208961301).

Almost surely, 2^696537665 is an apocalyptic number.

It is an amenable number.

696537665 is a deficient number, since it is larger than the sum of its proper divisors (139307539).

696537665 is a wasteful number, since it uses less digits than its factorization.

696537665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139307538.

The product of its digits is 6123600, while the sum is 53.

The square root of 696537665 is about 26392.0000189451. Note that the first 4 decimals coincide. The cubic root of 696537665 is about 886.4376666763.

The spelling of 696537665 in words is "six hundred ninety-six million, five hundred thirty-seven thousand, six hundred sixty-five".