640202689471 has 2 divisors, whose sum is σ = 640202689472. Its totient is φ = 640202689470.

The previous prime is 640202689439. The next prime is 640202689547. The reversal of 640202689471 is 174986202046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640202689471 - 2⁵ = 640202689439 is a prime.

It is a super-3 number, since 3×640202689471³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640202609471) by changing a digit.

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 as a sum of consecutive naturals, namely, 320101344735 + 320101344736.

It is an arithmetic number, because the mean of its divisors is an integer number (320101344736).

Almost surely, 2^640202689471 is an apocalyptic number.

640202689471 is a deficient number, since it is larger than the sum of its proper divisors (1).

640202689471 is an equidigital number, since it uses as much as digits as its factorization.

640202689471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 640202689471 in words is "six hundred forty billion, two hundred two million, six hundred eighty-nine thousand, four hundred seventy-one".