640154226550 has 24 divisors (see below), whose sum is σ = 1191168566136. Its totient is φ = 255958098240.

The previous prime is 640154226521. The next prime is 640154226553. The reversal of 640154226550 is 55622451046.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640154226553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2464924 + ... + 2712223.

It is an arithmetic number, because the mean of its divisors is an integer number (49632023589).

Almost surely, 2^640154226550 is an apocalyptic number.

640154226550 is a deficient number, since it is larger than the sum of its proper divisors (551014339586).

640154226550 is a wasteful number, since it uses less digits than its factorization.

640154226550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5179632 (or 5179627 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 40.

Adding to 640154226550 its reverse (55622451046), we get a palindrome (695776677596).

The spelling of 640154226550 in words is "six hundred forty billion, one hundred fifty-four million, two hundred twenty-six thousand, five hundred fifty".