645733265 has 8 divisors (see below), whose sum is σ = 782403648. Its totient is φ = 511570800.

The previous prime is 645733261. The next prime is 645733271. The reversal of 645733265 is 562337546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645733265 - 2² = 645733261 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645733261) 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, 626411 + ... + 627440.

It is an arithmetic number, because the mean of its divisors is an integer number (97800456).

Almost surely, 2^645733265 is an apocalyptic number.

It is an amenable number.

645733265 is a deficient number, since it is larger than the sum of its proper divisors (136670383).

645733265 is a wasteful number, since it uses less digits than its factorization.

645733265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253959.

The product of its digits is 453600, while the sum is 41.

The square root of 645733265 is about 25411.2822384074. The cubic root of 645733265 is about 864.3395517704.

The spelling of 645733265 in words is "six hundred forty-five million, seven hundred thirty-three thousand, two hundred sixty-five".