640104056212 has 24 divisors (see below), whose sum is σ = 1125021735936. Its totient is φ = 318672125568.

The previous prime is 640104056203. The next prime is 640104056237. The reversal of 640104056212 is 212650401046.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 543388 + ... + 1255180.

It is an arithmetic number, because the mean of its divisors is an integer number (46875905664).

Almost surely, 2^640104056212 is an apocalyptic number.

It is an amenable number.

640104056212 is a deficient number, since it is larger than the sum of its proper divisors (484917679724).

640104056212 is a wasteful number, since it uses less digits than its factorization.

640104056212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712767 (or 712765 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 640104056212 its reverse (212650401046), we get a palindrome (852754457258).

The spelling of 640104056212 in words is "six hundred forty billion, one hundred four million, fifty-six thousand, two hundred twelve".