640266421111 has 4 divisors (see below), whose sum is σ = 640274507712. Its totient is φ = 640258334512.

The previous prime is 640266421073. The next prime is 640266421133. The reversal of 640266421111 is 111124662046.

640266421111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 640266421111 - 2²⁹ = 639729550199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640266421511) 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, 3923350 + ... + 4083283.

It is an arithmetic number, because the mean of its divisors is an integer number (160068626928).

Almost surely, 2^640266421111 is an apocalyptic number.

640266421111 is a deficient number, since it is larger than the sum of its proper divisors (8086601).

640266421111 is an equidigital number, since it uses as much as digits as its factorization.

640266421111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8086600.

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 640266421111 in words is "six hundred forty billion, two hundred sixty-six million, four hundred twenty-one thousand, one hundred eleven".