68993980145 has 4 divisors (see below), whose sum is σ = 82792776180. Its totient is φ = 55195184112.

The previous prime is 68993980117. The next prime is 68993980151. The reversal of 68993980145 is 54108939986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43011441664 + 25982538481 = 207392^2 + 161191^2 .

It is a cyclic number.

It is not a de Polignac number, because 68993980145 - 2⁸ = 68993979889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6899398010 + ... + 6899398019.

It is an arithmetic number, because the mean of its divisors is an integer number (20698194045).

Almost surely, 2^68993980145 is an apocalyptic number.

It is an amenable number.

68993980145 is a deficient number, since it is larger than the sum of its proper divisors (13798796035).

68993980145 is a wasteful number, since it uses less digits than its factorization.

68993980145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13798796034.

The product of its (nonzero) digits is 16796160, while the sum is 62.

The spelling of 68993980145 in words is "sixty-eight billion, nine hundred ninety-three million, nine hundred eighty thousand, one hundred forty-five".