640201126 has 4 divisors (see below), whose sum is σ = 960301692. Its totient is φ = 320100562.

The previous prime is 640201117. The next prime is 640201127. The reversal of 640201126 is 621102046.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 640201097 and 640201106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640201127) 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 as a sum of consecutive naturals, namely, 160050280 + ... + 160050283.

It is an arithmetic number, because the mean of its divisors is an integer number (240075423).

Almost surely, 2^640201126 is an apocalyptic number.

640201126 is a deficient number, since it is larger than the sum of its proper divisors (320100566).

640201126 is a wasteful number, since it uses less digits than its factorization.

640201126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320100565.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 640201126 is about 25302.1960706971. The cubic root of 640201126 is about 861.8641400645.

The spelling of 640201126 in words is "six hundred forty million, two hundred one thousand, one hundred twenty-six".