640239290571 has 8 divisors (see below), whose sum is σ = 881189561344. Its totient is φ = 413057606760.

The previous prime is 640239290557. The next prime is 640239290591. The reversal of 640239290571 is 175092932046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640239290571 - 2⁶ = 640239290507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640239290571.

It is not an unprimeable number, because it can be changed into a prime (640239290501) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3442146631 + ... + 3442146816.

It is an arithmetic number, because the mean of its divisors is an integer number (110148695168).

Almost surely, 2^640239290571 is an apocalyptic number.

640239290571 is a deficient number, since it is larger than the sum of its proper divisors (240950270773).

640239290571 is a wasteful number, since it uses less digits than its factorization.

640239290571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6884293481.

The product of its (nonzero) digits is 816480, while the sum is 48.

The spelling of 640239290571 in words is "six hundred forty billion, two hundred thirty-nine million, two hundred ninety thousand, five hundred seventy-one".