640631011232 has 24 divisors (see below), whose sum is σ = 1262165024736. Its totient is φ = 320081163712.

The previous prime is 640631011151. The next prime is 640631011357. The reversal of 640631011232 is 232110136046.

It is a junction number, because it is equal to n+sod(n) for n = 640631011195 and 640631011204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7278758 + ... + 7366245.

It is an arithmetic number, because the mean of its divisors is an integer number (52590209364).

Almost surely, 2^640631011232 is an apocalyptic number.

It is an amenable number.

640631011232 is a deficient number, since it is larger than the sum of its proper divisors (621534013504).

640631011232 is a wasteful number, since it uses less digits than its factorization.

640631011232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14646380 (or 14646372 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 640631011232 its reverse (232110136046), we get a palindrome (872741147278).

The spelling of 640631011232 in words is "six hundred forty billion, six hundred thirty-one million, eleven thousand, two hundred thirty-two".