640060439041 has 4 divisors (see below), whose sum is σ = 640552416084. Its totient is φ = 639568462000.

The previous prime is 640060439033. The next prime is 640060439087. The reversal of 640060439041 is 140934060046.

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

It can be written as a sum of positive squares in 2 ways, for example, as 313819558416 + 326240880625 = 560196^2 + 571175^2 .

It is a cyclic number.

It is not a de Polignac number, because 640060439041 - 2³ = 640060439033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640060431041) 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, 245986570 + ... + 245989171.

It is an arithmetic number, because the mean of its divisors is an integer number (160138104021).

Almost surely, 2^640060439041 is an apocalyptic number.

It is an amenable number.

640060439041 is a deficient number, since it is larger than the sum of its proper divisors (491977043).

640060439041 is a wasteful number, since it uses less digits than its factorization.

640060439041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491977042.

The product of its (nonzero) digits is 62208, while the sum is 37.

Adding to 640060439041 its reverse (140934060046), we get a palindrome (780994499087).

The spelling of 640060439041 in words is "six hundred forty billion, sixty million, four hundred thirty-nine thousand, forty-one".