645234005331 has 32 divisors (see below), whose sum is σ = 960334341120. Its totient is φ = 428164281792.

The previous prime is 645234005327. The next prime is 645234005389. The reversal of 645234005331 is 133500432546.

645234005331 is a `hidden beast` number, since 64 + 5 + 23 + 40 + 0 + 533 + 1 = 666.

It is not a de Polignac number, because 645234005331 - 2² = 645234005327 is a prime.

It is a super-2 number, since 2×645234005331² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645234005831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8647375 + ... + 8721671.

It is an arithmetic number, because the mean of its divisors is an integer number (30010448160).

Almost surely, 2^645234005331 is an apocalyptic number.

645234005331 is a deficient number, since it is larger than the sum of its proper divisors (315100335789).

645234005331 is a wasteful number, since it uses less digits than its factorization.

645234005331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75792 (or 75786 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

Adding to 645234005331 its reverse (133500432546), we get a palindrome (778734437877).

The spelling of 645234005331 in words is "six hundred forty-five billion, two hundred thirty-four million, five thousand, three hundred thirty-one".