645246206447 has 8 divisors (see below), whose sum is σ = 673348577280. Its totient is φ = 617147851320.

The previous prime is 645246206399. The next prime is 645246206453. The reversal of 645246206447 is 744602642546.

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 645246206447 - 2²⁸ = 644977770991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645246206395 and 645246206404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645246208447) 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, 673247 + ... + 1320512.

It is an arithmetic number, because the mean of its divisors is an integer number (84168572160).

Almost surely, 2^645246206447 is an apocalyptic number.

645246206447 is a deficient number, since it is larger than the sum of its proper divisors (28102370833).

645246206447 is a wasteful number, since it uses less digits than its factorization.

645246206447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007853.

The product of its (nonzero) digits is 7741440, while the sum is 50.

The spelling of 645246206447 in words is "six hundred forty-five billion, two hundred forty-six million, two hundred six thousand, four hundred forty-seven".