68799961581 has 16 divisors (see below), whose sum is σ = 98932693440. Its totient is φ = 42277150080.

The previous prime is 68799961541. The next prime is 68799961589. The reversal of 68799961581 is 18516999786.

It is not a de Polignac number, because 68799961581 - 2⁷ = 68799961453 is a prime.

It is a super-2 number, since 2×68799961581² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68799961589) 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, 1249536 + ... + 1303433.

It is an arithmetic number, because the mean of its divisors is an integer number (6183293340).

Almost surely, 2^68799961581 is an apocalyptic number.

It is an amenable number.

68799961581 is a deficient number, since it is larger than the sum of its proper divisors (30132731859).

68799961581 is a wasteful number, since it uses less digits than its factorization.

68799961581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2553676.

The product of its digits is 58786560, while the sum is 69.

The spelling of 68799961581 in words is "sixty-eight billion, seven hundred ninety-nine million, nine hundred sixty-one thousand, five hundred eighty-one".