641040550 has 12 divisors (see below), whose sum is σ = 1192335516. Its totient is φ = 256416200.

The previous prime is 641040541. The next prime is 641040553. The reversal of 641040550 is 55040146.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641040553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6410356 + ... + 6410455.

It is an arithmetic number, because the mean of its divisors is an integer number (99361293).

Almost surely, 2^641040550 is an apocalyptic number.

641040550 is a deficient number, since it is larger than the sum of its proper divisors (551294966).

641040550 is a wasteful number, since it uses less digits than its factorization.

641040550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12820823 (or 12820818 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 641040550 is about 25318.7786040322. The cubic root of 641040550 is about 862.2406641719.

Adding to 641040550 its reverse (55040146), we get a palindrome (696080696).

The spelling of 641040550 in words is "six hundred forty-one million, forty thousand, five hundred fifty".