645123333311 has 8 divisors (see below), whose sum is σ = 650850897600. Its totient is φ = 639396093952.

The previous prime is 645123333277. The next prime is 645123333347. The reversal of 645123333311 is 113333321546.

It is a happy number.

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 645123333311 - 2³⁸ = 370245426367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645123333611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5764415 + ... + 5875263.

It is an arithmetic number, because the mean of its divisors is an integer number (81356362200).

Almost surely, 2^645123333311 is an apocalyptic number.

645123333311 is a deficient number, since it is larger than the sum of its proper divisors (5727564289).

645123333311 is a wasteful number, since it uses less digits than its factorization.

645123333311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162465.

The product of its digits is 58320, while the sum is 35.

Adding to 645123333311 its reverse (113333321546), we get a palindrome (758456654857).

The spelling of 645123333311 in words is "six hundred forty-five billion, one hundred twenty-three million, three hundred thirty-three thousand, three hundred eleven".