645104563435331 has 8 divisors (see below), whose sum is σ = 647441674855104. Its totient is φ = 642769790299560.

The previous prime is 645104563435303. The next prime is 645104563435429. The reversal of 645104563435331 is 133534365401546.

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 645104563435331 - 2³⁸ = 644829685528387 is a prime.

It is a super-2 number, since 2×645104563435331² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645104563431331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 584018225 + ... + 585121778.

It is an arithmetic number, because the mean of its divisors is an integer number (80930209356888).

Almost surely, 2^{645104563435331} is an apocalyptic number.

645104563435331 is a deficient number, since it is larger than the sum of its proper divisors (2337111419773).

645104563435331 is a wasteful number, since it uses less digits than its factorization.

645104563435331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169142001.

The product of its (nonzero) digits is 23328000, while the sum is 53.

The spelling of 645104563435331 in words is "six hundred forty-five trillion, one hundred four billion, five hundred sixty-three million, four hundred thirty-five thousand, three hundred thirty-one".