640632431102 has 8 divisors (see below), whose sum is σ = 961246255800. Its totient is φ = 320217012504.

The previous prime is 640632431093. The next prime is 640632431113. The reversal of 640632431102 is 201134236046.

640632431102 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 49593452 + ... + 49606367.

It is an arithmetic number, because the mean of its divisors is an integer number (120155781975).

Almost surely, 2^640632431102 is an apocalyptic number.

640632431102 is a deficient number, since it is larger than the sum of its proper divisors (320613824698).

640632431102 is a wasteful number, since it uses less digits than its factorization.

640632431102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99203050.

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 640632431102 its reverse (201134236046), we get a palindrome (841766667148).

The spelling of 640632431102 in words is "six hundred forty billion, six hundred thirty-two million, four hundred thirty-one thousand, one hundred two".