645122323135 has 4 divisors (see below), whose sum is σ = 774146787768. Its totient is φ = 516097858504.

The previous prime is 645122323123. The next prime is 645122323159. The reversal of 645122323135 is 531323221546.

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

It is a cyclic number.

It is not a de Polignac number, because 645122323135 - 2³⁷ = 507683369663 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645122323094 and 645122323103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64512232309 + ... + 64512232318.

It is an arithmetic number, because the mean of its divisors is an integer number (193536696942).

Almost surely, 2^645122323135 is an apocalyptic number.

645122323135 is a deficient number, since it is larger than the sum of its proper divisors (129024464633).

645122323135 is a wasteful number, since it uses less digits than its factorization.

645122323135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129024464632.

The product of its digits is 129600, while the sum is 37.

The spelling of 645122323135 in words is "six hundred forty-five billion, one hundred twenty-two million, three hundred twenty-three thousand, one hundred thirty-five".