640343134170 has 96 divisors (see below), whose sum is σ = 1740058603920. Its totient is φ = 163170201600.

The previous prime is 640343134157. The next prime is 640343134181. The reversal of 640343134170 is 71431343046.

640343134170 is a `hidden beast` number, since 640 + 3 + 4 + 3 + 1 + 3 + 4 + 1 + 7 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 216038110401 + 424305023769 = 464799^2 + 651387^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1011481 + ... + 1517820.

Almost surely, 2^640343134170 is an apocalyptic number.

640343134170 is an abundant number, since it is smaller than the sum of its proper divisors (1099715469750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640343134170 is a wasteful number, since it uses less digits than its factorization.

640343134170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529440 (or 2529437 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The spelling of 640343134170 in words is "six hundred forty billion, three hundred forty-three million, one hundred thirty-four thousand, one hundred seventy".