645606620343 has 20 divisors (see below), whose sum is σ = 965102617248. Its totient is φ = 430101874080.

The previous prime is 645606620273. The next prime is 645606620389. The reversal of 645606620343 is 343026606546.

645606620343 is a `hidden beast` number, since 6 + 4 + 5 + 606 + 6 + 2 + 0 + 34 + 3 = 666.

It is not a de Polignac number, because 645606620343 - 2²² = 645602426039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645606620843) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2685318 + ... + 2915843.

Almost surely, 2^645606620343 is an apocalyptic number.

645606620343 is a deficient number, since it is larger than the sum of its proper divisors (319495996905).

645606620343 is a wasteful number, since it uses less digits than its factorization.

645606620343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5602596 (or 5602587 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 45.

The spelling of 645606620343 in words is "six hundred forty-five billion, six hundred six million, six hundred twenty thousand, three hundred forty-three".