640267011 has 10 divisors (see below), whose sum is σ = 956448372. Its totient is φ = 426844620.

The previous prime is 640267009. The next prime is 640267021. The reversal of 640267011 is 110762046.

640267011 is a `hidden beast` number, since 640 + 2 + 6 + 7 + 0 + 11 = 666.

It is not a de Polignac number, because 640267011 - 2¹ = 640267009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (640267021) 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 9 ways as a sum of consecutive naturals, for example, 3952185 + ... + 3952346.

Almost surely, 2^640267011 is an apocalyptic number.

640267011 is a deficient number, since it is larger than the sum of its proper divisors (316181361).

640267011 is an equidigital number, since it uses as much as digits as its factorization.

640267011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7904543 (or 7904534 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 640267011 is about 25303.4979992886. The cubic root of 640267011 is about 861.8937047168.

The spelling of 640267011 in words is "six hundred forty million, two hundred sixty-seven thousand, eleven".