640164441226 has 16 divisors (see below), whose sum is σ = 991864908288. Its totient is φ = 309556191600.

The previous prime is 640164441221. The next prime is 640164441227. The reversal of 640164441226 is 622144461046.

It is not an unprimeable number, because it can be changed into a prime (640164441221) 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, 3250165 + ... + 3441496.

It is an arithmetic number, because the mean of its divisors is an integer number (61991556768).

Almost surely, 2^640164441226 is an apocalyptic number.

640164441226 is a deficient number, since it is larger than the sum of its proper divisors (351700467062).

640164441226 is a wasteful number, since it uses less digits than its factorization.

640164441226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6693237.

The product of its (nonzero) digits is 221184, while the sum is 40.

The spelling of 640164441226 in words is "six hundred forty billion, one hundred sixty-four million, four hundred forty-one thousand, two hundred twenty-six".