640462136055 has 64 divisors (see below), whose sum is σ = 1211703779328. Its totient is φ = 282683105280.

The previous prime is 640462136003. The next prime is 640462136059. The reversal of 640462136055 is 550631264046.

640462136055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640462136055 - 2¹⁷ = 640462004983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640462135998 and 640462136016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640462136059) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1182207 + ... + 1636623.

It is an arithmetic number, because the mean of its divisors is an integer number (18932871552).

Almost surely, 2^640462136055 is an apocalyptic number.

640462136055 is a deficient number, since it is larger than the sum of its proper divisors (571241643273).

640462136055 is a wasteful number, since it uses less digits than its factorization.

640462136055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454896.

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 640462136055 in words is "six hundred forty billion, four hundred sixty-two million, one hundred thirty-six thousand, fifty-five".