640441440404012 has 12 divisors (see below), whose sum is σ = 1206985791530736. Its totient is φ = 295588357109520.

The previous prime is 640441440404011. The next prime is 640441440404027. The reversal of 640441440404012 is 210404044144046.

It is a super-2 number, since 2×640441440404012² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640441440404011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6158090773064 + ... + 6158090773167.

It is an arithmetic number, because the mean of its divisors is an integer number (100582149294228).

Almost surely, 2^{640441440404012} is an apocalyptic number.

It is an amenable number.

640441440404012 is a deficient number, since it is larger than the sum of its proper divisors (566544351126724).

640441440404012 is a wasteful number, since it uses less digits than its factorization.

640441440404012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12316181546248 (or 12316181546246 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 38.

Adding to 640441440404012 its reverse (210404044144046), we get a palindrome (850845484548058).

The spelling of 640441440404012 in words is "six hundred forty trillion, four hundred forty-one billion, four hundred forty million, four hundred four thousand, twelve".