641563550 has 24 divisors (see below), whose sum is σ = 1199917992. Its totient is φ = 255204000.

The previous prime is 641563511. The next prime is 641563553. The reversal of 641563550 is 55365146.

It is a self number, because there is not a number n which added to its sum of digits gives 641563550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641563553) 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, 26396 + ... + 44495.

It is an arithmetic number, because the mean of its divisors is an integer number (49996583).

Almost surely, 2^641563550 is an apocalyptic number.

641563550 is a deficient number, since it is larger than the sum of its proper divisors (558354442).

641563550 is a wasteful number, since it uses less digits than its factorization.

641563550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71084 (or 71079 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 641563550 is about 25329.1048006044. The cubic root of 641563550 is about 862.4750899478.

The spelling of 641563550 in words is "six hundred forty-one million, five hundred sixty-three thousand, five hundred fifty".