67720217445 has 24 divisors (see below), whose sum is σ = 117397093632. Its totient is φ = 36112716000.

The previous prime is 67720217441. The next prime is 67720217501. The reversal of 67720217445 is 54471202776.

It is not a de Polignac number, because 67720217445 - 2² = 67720217441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 67720217445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67720217441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 263160 + ... + 452430.

It is an arithmetic number, because the mean of its divisors is an integer number (4891545568).

Almost surely, 2^67720217445 is an apocalyptic number.

It is an amenable number.

67720217445 is a deficient number, since it is larger than the sum of its proper divisors (49676876187).

67720217445 is a wasteful number, since it uses less digits than its factorization.

67720217445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197233 (or 197230 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 45.

The spelling of 67720217445 in words is "sixty-seven billion, seven hundred twenty million, two hundred seventeen thousand, four hundred forty-five".