645253311 has 8 divisors (see below), whose sum is σ = 860485680. Its totient is φ = 430094912.

The previous prime is 645253307. The next prime is 645253327. The reversal of 645253311 is 113352546.

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 645253311 - 2² = 645253307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645253331) 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, 6811 + ... + 36563.

It is an arithmetic number, because the mean of its divisors is an integer number (107560710).

Almost surely, 2^645253311 is an apocalyptic number.

645253311 is a deficient number, since it is larger than the sum of its proper divisors (215232369).

645253311 is a wasteful number, since it uses less digits than its factorization.

645253311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36985.

The product of its digits is 10800, while the sum is 30.

The square root of 645253311 is about 25401.8367642972. The cubic root of 645253311 is about 864.1253528793.

The spelling of 645253311 in words is "six hundred forty-five million, two hundred fifty-three thousand, three hundred eleven".