68605521635 has 32 divisors (see below), whose sum is σ = 94930790400. Its totient is φ = 46624038912.

The previous prime is 68605521631. The next prime is 68605521661. The reversal of 68605521635 is 53612550686.

It is a cyclic number.

It is not a de Polignac number, because 68605521635 - 2² = 68605521631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68605521635.

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

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1770842 + ... + 1809168.

It is an arithmetic number, because the mean of its divisors is an integer number (2966587200).

Almost surely, 2^68605521635 is an apocalyptic number.

68605521635 is a deficient number, since it is larger than the sum of its proper divisors (26325268765).

68605521635 is a wasteful number, since it uses less digits than its factorization.

68605521635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38795.

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 68605521635 in words is "sixty-eight billion, six hundred five million, five hundred twenty-one thousand, six hundred thirty-five".