68745219509 has 4 divisors (see below), whose sum is σ = 69387698304. Its totient is φ = 68102740716.

The previous prime is 68745219479. The next prime is 68745219527. The reversal of 68745219509 is 90591254786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68745219509 - 2²⁰ = 68744170933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68745219589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321239237 + ... + 321239450.

It is an arithmetic number, because the mean of its divisors is an integer number (17346924576).

Almost surely, 2^68745219509 is an apocalyptic number.

It is an amenable number.

68745219509 is a deficient number, since it is larger than the sum of its proper divisors (642478795).

68745219509 is a wasteful number, since it uses less digits than its factorization.

68745219509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642478794.

The product of its (nonzero) digits is 5443200, while the sum is 56.

The spelling of 68745219509 in words is "sixty-eight billion, seven hundred forty-five million, two hundred nineteen thousand, five hundred nine".