645111269 has 8 divisors (see below), whose sum is σ = 704805408. Its totient is φ = 585591760.

The previous prime is 645111263. The next prime is 645111289. The reversal of 645111269 is 962111546.

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 645111269 - 2²⁰ = 644062693 is a prime.

It is a super-2 number, since 2×645111269² = 832337098781580722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645111263) 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, 35867 + ... + 50760.

It is an arithmetic number, because the mean of its divisors is an integer number (88100676).

Almost surely, 2^645111269 is an apocalyptic number.

It is an amenable number.

645111269 is a deficient number, since it is larger than the sum of its proper divisors (59694139).

645111269 is a wasteful number, since it uses less digits than its factorization.

645111269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87315.

The product of its digits is 12960, while the sum is 35.

The square root of 645111269 is about 25399.0407102316. The cubic root of 645111269 is about 864.0619405218.

The spelling of 645111269 in words is "six hundred forty-five million, one hundred eleven thousand, two hundred sixty-nine".