645582965 has 8 divisors (see below), whose sum is σ = 774853560. Its totient is φ = 516363712.

The previous prime is 645582961. The next prime is 645582979. The reversal of 645582965 is 569285546.

It can be written as a sum of positive squares in 4 ways, for example, as 18130564 + 627452401 = 4258^2 + 25049^2 .

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 645582965 - 2² = 645582961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645582961) 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, 24947 + ... + 43743.

It is an arithmetic number, because the mean of its divisors is an integer number (96856695).

Almost surely, 2^645582965 is an apocalyptic number.

It is an amenable number.

645582965 is a deficient number, since it is larger than the sum of its proper divisors (129270595).

645582965 is a wasteful number, since it uses less digits than its factorization.

645582965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25671.

The product of its digits is 2592000, while the sum is 50.

The square root of 645582965 is about 25408.3247184855. The cubic root of 645582965 is about 864.2724857323.

The spelling of 645582965 in words is "six hundred forty-five million, five hundred eighty-two thousand, nine hundred sixty-five".