68513581641 has 8 divisors (see below), whose sum is σ = 91357412544. Its totient is φ = 45672735920.

The previous prime is 68513581627. The next prime is 68513581649. The reversal of 68513581641 is 14618531586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68513581641 - 2¹⁰ = 68513580617 is a prime.

It is a super-2 number, since 2×68513581641² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68513581649) 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, 692181 + ... + 784946.

It is an arithmetic number, because the mean of its divisors is an integer number (11419676568).

Almost surely, 2^68513581641 is an apocalyptic number.

It is an amenable number.

68513581641 is a deficient number, since it is larger than the sum of its proper divisors (22843830903).

68513581641 is a wasteful number, since it uses less digits than its factorization.

68513581641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492591.

The product of its digits is 691200, while the sum is 48.

The spelling of 68513581641 in words is "sixty-eight billion, five hundred thirteen million, five hundred eighty-one thousand, six hundred forty-one".