640266346042 has 4 divisors (see below), whose sum is σ = 960399519066. Its totient is φ = 320133173020.

The previous prime is 640266345967. The next prime is 640266346073. The reversal of 640266346042 is 240643662046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 467184553081 + 173081792961 = 683509^2 + 416031^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 640266346042.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160066586509 + ... + 160066586512.

Almost surely, 2^640266346042 is an apocalyptic number.

640266346042 is a deficient number, since it is larger than the sum of its proper divisors (320133173024).

640266346042 is a wasteful number, since it uses less digits than its factorization.

640266346042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320133173023.

The product of its (nonzero) digits is 995328, while the sum is 43.

The spelling of 640266346042 in words is "six hundred forty billion, two hundred sixty-six million, three hundred forty-six thousand, forty-two".