645460134233 has 4 divisors (see below), whose sum is σ = 646084975668. Its totient is φ = 644835292800.

The previous prime is 645460134229. The next prime is 645460134239. The reversal of 645460134233 is 332431064546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 517301862169 + 128158272064 = 719237^2 + 357992^2 .

It is a cyclic number.

It is not a de Polignac number, because 645460134233 - 2² = 645460134229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (645460134239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312419168 + ... + 312421233.

It is an arithmetic number, because the mean of its divisors is an integer number (161521243917).

Almost surely, 2^645460134233 is an apocalyptic number.

It is an amenable number.

645460134233 is a deficient number, since it is larger than the sum of its proper divisors (624841435).

645460134233 is a wasteful number, since it uses less digits than its factorization.

645460134233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624841434.

The product of its (nonzero) digits is 622080, while the sum is 41.

Adding to 645460134233 its reverse (332431064546), we get a palindrome (977891198779).

The spelling of 645460134233 in words is "six hundred forty-five billion, four hundred sixty million, one hundred thirty-four thousand, two hundred thirty-three".