641630265 has 16 divisors (see below), whose sum is σ = 1037194368. Its totient is φ = 338674176.

The previous prime is 641630263. The next prime is 641630267. The reversal of 641630265 is 562036146.

It is an interprime number because it is at equal distance from previous prime (641630263) and next prime (641630267).

It is not a de Polignac number, because 641630265 - 2¹ = 641630263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641630261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219037 + ... + 221946.

It is an arithmetic number, because the mean of its divisors is an integer number (64824648).

Almost surely, 2^641630265 is an apocalyptic number.

It is an amenable number.

641630265 is a deficient number, since it is larger than the sum of its proper divisors (395564103).

641630265 is a wasteful number, since it uses less digits than its factorization.

641630265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441088.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 641630265 is about 25330.4217296120. The cubic root of 641630265 is about 862.5049846383.

The spelling of 641630265 in words is "six hundred forty-one million, six hundred thirty thousand, two hundred sixty-five".