686763653 has 4 divisors (see below), whose sum is σ = 703514028. Its totient is φ = 670013280.

The previous prime is 686763643. The next prime is 686763661. The reversal of 686763653 is 356367686.

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 307020484 + 379743169 = 17522^2 + 19487^2 .

It is a cyclic number.

It is not a de Polignac number, because 686763653 - 2¹⁸ = 686501509 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 (686763613) 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, 8375126 + ... + 8375207.

It is an arithmetic number, because the mean of its divisors is an integer number (175878507).

Almost surely, 2^686763653 is an apocalyptic number.

It is an amenable number.

686763653 is a deficient number, since it is larger than the sum of its proper divisors (16750375).

686763653 is a wasteful number, since it uses less digits than its factorization.

686763653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16750374.

The product of its digits is 3265920, while the sum is 50.

The square root of 686763653 is about 26206.1758560840. The cubic root of 686763653 is about 882.2718729169.

The spelling of 686763653 in words is "six hundred eighty-six million, seven hundred sixty-three thousand, six hundred fifty-three".