640561142411 has 4 divisors (see below), whose sum is σ = 641389812192. Its totient is φ = 639732472632.

The previous prime is 640561142369. The next prime is 640561142413. The reversal of 640561142411 is 114241165046.

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 640561142411 - 2²² = 640556948107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640561142413) 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, 414333731 + ... + 414335276.

It is an arithmetic number, because the mean of its divisors is an integer number (160347453048).

Almost surely, 2^640561142411 is an apocalyptic number.

640561142411 is a deficient number, since it is larger than the sum of its proper divisors (828669781).

640561142411 is an equidigital number, since it uses as much as digits as its factorization.

640561142411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828669780.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 640561142411 in words is "six hundred forty billion, five hundred sixty-one million, one hundred forty-two thousand, four hundred eleven".