640402000270671 has 4 divisors (see below), whose sum is σ = 853869333694232. Its totient is φ = 426934666847112.

The previous prime is 640402000270661. The next prime is 640402000270717. The reversal of 640402000270671 is 176072000204046.

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

It is not a de Polignac number, because 640402000270671 - 2¹¹ = 640402000268623 is a prime.

It is a super-2 number, since 2×640402000270671² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640402000270661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106733666711776 + ... + 106733666711781.

It is an arithmetic number, because the mean of its divisors is an integer number (213467333423558).

Almost surely, 2^{640402000270671} is an apocalyptic number.

640402000270671 is a deficient number, since it is larger than the sum of its proper divisors (213467333423561).

640402000270671 is a wasteful number, since it uses less digits than its factorization.

640402000270671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213467333423560.

The product of its (nonzero) digits is 112896, while the sum is 39.

The spelling of 640402000270671 in words is "six hundred forty trillion, four hundred two billion, two hundred seventy thousand, six hundred seventy-one".