645611351111 has 4 divisors (see below), whose sum is σ = 645627031824. Its totient is φ = 645595670400.

The previous prime is 645611351051. The next prime is 645611351113. The reversal of 645611351111 is 111153116546.

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 645611351111 - 2²⁶ = 645544242247 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 (645611351113) 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, 7778435 + ... + 7860996.

It is an arithmetic number, because the mean of its divisors is an integer number (161406757956).

Almost surely, 2^645611351111 is an apocalyptic number.

645611351111 is a deficient number, since it is larger than the sum of its proper divisors (15680713).

645611351111 is a wasteful number, since it uses less digits than its factorization.

645611351111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15680712.

The product of its digits is 10800, while the sum is 35.

Adding to 645611351111 its reverse (111153116546), we get a palindrome (756764467657).

The spelling of 645611351111 in words is "six hundred forty-five billion, six hundred eleven million, three hundred fifty-one thousand, one hundred eleven".