640455131711 has 8 divisors (see below), whose sum is σ = 661241946624. Its totient is φ = 619914314880.

The previous prime is 640455131689. The next prime is 640455131747. The reversal of 640455131711 is 117131554046.

640455131711 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640455131711 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 (640455137711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61494230 + ... + 61504643.

It is an arithmetic number, because the mean of its divisors is an integer number (82655243328).

Almost surely, 2^640455131711 is an apocalyptic number.

640455131711 is a deficient number, since it is larger than the sum of its proper divisors (20786814913).

640455131711 is a wasteful number, since it uses less digits than its factorization.

640455131711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122999041.

The product of its (nonzero) digits is 50400, while the sum is 38.

Adding to 640455131711 its reverse (117131554046), we get a palindrome (757586685757).

The spelling of 640455131711 in words is "six hundred forty billion, four hundred fifty-five million, one hundred thirty-one thousand, seven hundred eleven".