68605521634 has 16 divisors (see below), whose sum is σ = 111202556472. Its totient is φ = 31556014848.

The previous prime is 68605521631. The next prime is 68605521661. The reversal of 68605521634 is 43612550686.

It can be written as a sum of positive squares in 4 ways, for example, as 46059598225 + 22545923409 = 214615^2 + 150153^2 .

It is not an unprimeable number, because it can be changed into a prime (68605521631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4495239 + ... + 4510474.

Almost surely, 2^68605521634 is an apocalyptic number.

68605521634 is a deficient number, since it is larger than the sum of its proper divisors (42597034838).

68605521634 is a wasteful number, since it uses less digits than its factorization.

68605521634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9006021.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 68605521634 in words is "sixty-eight billion, six hundred five million, five hundred twenty-one thousand, six hundred thirty-four".