640642234612 has 12 divisors (see below), whose sum is σ = 1180130432320. Its totient is φ = 303462111096.

The previous prime is 640642234597. The next prime is 640642234693. The reversal of 640642234612 is 216432246046.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 4214751468 + ... + 4214751619.

Almost surely, 2^640642234612 is an apocalyptic number.

It is an amenable number.

640642234612 is a deficient number, since it is larger than the sum of its proper divisors (539488197708).

640642234612 is a wasteful number, since it uses less digits than its factorization.

640642234612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8429503110 (or 8429503108 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 640642234612 in words is "six hundred forty billion, six hundred forty-two million, two hundred thirty-four thousand, six hundred twelve".