68781617530 has 32 divisors (see below), whose sum is σ = 129802186368. Its totient is φ = 26191704000.

The previous prime is 68781617519. The next prime is 68781617539. The reversal of 68781617530 is 3571618786.

It is not an unprimeable number, because it can be changed into a prime (68781617539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 660121 + ... + 757180.

It is an arithmetic number, because the mean of its divisors is an integer number (4056318324).

Almost surely, 2^68781617530 is an apocalyptic number.

68781617530 is a deficient number, since it is larger than the sum of its proper divisors (61020568838).

68781617530 is a wasteful number, since it uses less digits than its factorization.

68781617530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417542.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 68781617530 in words is "sixty-eight billion, seven hundred eighty-one million, six hundred seventeen thousand, five hundred thirty".