68990745745 has 4 divisors (see below), whose sum is σ = 82788894900. Its totient is φ = 55192596592.

The previous prime is 68990745731. The next prime is 68990745793. The reversal of 68990745745 is 54754709986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54754709986 = 2 ⋅27377354993.

It can be written as a sum of positive squares in 2 ways, for example, as 39438385281 + 29552360464 = 198591^2 + 171908^2 .

It is a cyclic number.

It is not a de Polignac number, because 68990745745 - 2²⁵ = 68957191313 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6899074570 + ... + 6899074579.

It is an arithmetic number, because the mean of its divisors is an integer number (20697223725).

Almost surely, 2^68990745745 is an apocalyptic number.

It is an amenable number.

68990745745 is a deficient number, since it is larger than the sum of its proper divisors (13798149155).

68990745745 is a wasteful number, since it uses less digits than its factorization.

68990745745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13798149154.

The product of its (nonzero) digits is 76204800, while the sum is 64.

The spelling of 68990745745 in words is "sixty-eight billion, nine hundred ninety million, seven hundred forty-five thousand, seven hundred forty-five".