640151560171 has 4 divisors (see below), whose sum is σ = 641013137712. Its totient is φ = 639289982632.

The previous prime is 640151560133. The next prime is 640151560183. The reversal of 640151560171 is 171065151046.

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

It is a cyclic number.

It is not a de Polignac number, because 640151560171 - 2²⁷ = 640017342443 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 640151560171.

It is not an unprimeable number, because it can be changed into a prime (640151560271) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 430787656 + ... + 430789141.

It is an arithmetic number, because the mean of its divisors is an integer number (160253284428).

Almost surely, 2^640151560171 is an apocalyptic number.

640151560171 is a deficient number, since it is larger than the sum of its proper divisors (861577541).

640151560171 is an equidigital number, since it uses as much as digits as its factorization.

640151560171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861577540.

The product of its (nonzero) digits is 25200, while the sum is 37.

The spelling of 640151560171 in words is "six hundred forty billion, one hundred fifty-one million, five hundred sixty thousand, one hundred seventy-one".