640441111200 has 144 divisors (see below), whose sum is σ = 2274148257696. Its totient is φ = 155258444800.

The previous prime is 640441111183. The next prime is 640441111229. The reversal of 640441111200 is 2111144046.

It is a super-3 number, since 3×640441111200³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12103167 + ... + 12155966.

It is an arithmetic number, because the mean of its divisors is an integer number (15792696234).

Almost surely, 2^640441111200 is an apocalyptic number.

640441111200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640441111200 is an abundant number, since it is smaller than the sum of its proper divisors (1633707146496).

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

640441111200 is a wasteful number, since it uses less digits than its factorization.

640441111200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24259167 (or 24259154 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 640441111200 its reverse (2111144046), we get a palindrome (642552255246).

The spelling of 640441111200 in words is "six hundred forty billion, four hundred forty-one million, one hundred eleven thousand, two hundred".