643162065 has 64 divisors (see below), whose sum is σ = 1333248000. Its totient is φ = 257105664.

The previous prime is 643162063. The next prime is 643162081. The reversal of 643162065 is 560261346.

It is not a de Polignac number, because 643162065 - 2¹ = 643162063 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (643162061) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13536 + ... + 38334.

It is an arithmetic number, because the mean of its divisors is an integer number (20832000).

Almost surely, 2^643162065 is an apocalyptic number.

643162065 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

643162065 is an abundant number, since it is smaller than the sum of its proper divisors (690085935).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643162065 is a wasteful number, since it uses less digits than its factorization.

643162065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24846.

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

The square root of 643162065 is about 25360.6400747300. The cubic root of 643162065 is about 863.1908080373.

The spelling of 643162065 in words is "six hundred forty-three million, one hundred sixty-two thousand, sixty-five".