640222136622 has 64 divisors (see below), whose sum is σ = 1438989557760. Its totient is φ = 210978214272.

The previous prime is 640222136621. The next prime is 640222136647. The reversal of 640222136622 is 226631222046.

640222136622 is a `hidden beast` number, since 6 + 4 + 0 + 2 + 2 + 21 + 3 + 6 + 622 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640222136621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1775878 + ... + 2105750.

It is an arithmetic number, because the mean of its divisors is an integer number (22484211840).

Almost surely, 2^640222136622 is an apocalyptic number.

640222136622 is an abundant number, since it is smaller than the sum of its proper divisors (798767421138).

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

640222136622 is a wasteful number, since it uses less digits than its factorization.

640222136622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330294 (or 330288 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 640222136622 its reverse (226631222046), we get a palindrome (866853358668).

The spelling of 640222136622 in words is "six hundred forty billion, two hundred twenty-two million, one hundred thirty-six thousand, six hundred twenty-two".