645232265 has 8 divisors (see below), whose sum is σ = 776174280. Its totient is φ = 514922112.

The previous prime is 645232241. The next prime is 645232283. The reversal of 645232265 is 562232546.

It can be written as a sum of positive squares in 4 ways, for example, as 142396489 + 502835776 = 11933^2 + 22424^2 .

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 645232265 - 2²⁶ = 578123401 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155714 + ... + 159803.

It is an arithmetic number, because the mean of its divisors is an integer number (97021785).

Almost surely, 2^645232265 is an apocalyptic number.

It is an amenable number.

645232265 is a deficient number, since it is larger than the sum of its proper divisors (130942015).

645232265 is a wasteful number, since it uses less digits than its factorization.

645232265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315931.

The product of its digits is 86400, while the sum is 35.

The square root of 645232265 is about 25401.4224995373. The cubic root of 645232265 is about 864.1159578198.

The spelling of 645232265 in words is "six hundred forty-five million, two hundred thirty-two thousand, two hundred sixty-five".