645343868343546 has 48 divisors (see below), whose sum is σ = 1436329543993344. Its totient is φ = 209294400817152.

The previous prime is 645343868343527. The next prime is 645343868343653.

It is a happy number.

645343868343546 is a `hidden beast` number, since 6 + 4 + 5 + 3 + 4 + 38 + 6 + 8 + 3 + 43 + 546 = 666.

645343868343546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645343868343546² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1621936506 + ... + 1622334341.

It is an arithmetic number, because the mean of its divisors is an integer number (29923532166528).

Almost surely, 2^{645343868343546} is an apocalyptic number.

645343868343546 is an abundant number, since it is smaller than the sum of its proper divisors (790985675649798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645343868343546 is a wasteful number, since it uses less digits than its factorization.

645343868343546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3244271155 (or 3244271152 counting only the distinct ones).

The product of its digits is 7166361600, while the sum is 72.

The spelling of 645343868343546 in words is "six hundred forty-five trillion, three hundred forty-three billion, eight hundred sixty-eight million, three hundred forty-three thousand, five hundred forty-six".