645711784447 has 8 divisors (see below), whose sum is σ = 658092963600. Its totient is φ = 633378502464.

The previous prime is 645711784409. The next prime is 645711784457. The reversal of 645711784447 is 744487117546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645711784447 - 2³⁵ = 611352046079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645711784391 and 645711784400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645711784457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11947072 + ... + 12000997.

It is an arithmetic number, because the mean of its divisors is an integer number (82261620450).

Almost surely, 2^645711784447 is an apocalyptic number.

645711784447 is a deficient number, since it is larger than the sum of its proper divisors (12381179153).

645711784447 is a wasteful number, since it uses less digits than its factorization.

645711784447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23948585.

The product of its digits is 21073920, while the sum is 58.

The spelling of 645711784447 in words is "six hundred forty-five billion, seven hundred eleven million, seven hundred eighty-four thousand, four hundred forty-seven".