640656211134 has 16 divisors (see below), whose sum is σ = 1300436489088. Its totient is φ = 210364725912.

The previous prime is 640656211061. The next prime is 640656211141. The reversal of 640656211134 is 431112656046.

It is a junction number, because it is equal to n+sod(n) for n = 640656211092 and 640656211101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796835682 + ... + 796836485.

It is an arithmetic number, because the mean of its divisors is an integer number (81277280568).

Almost surely, 2^640656211134 is an apocalyptic number.

640656211134 is an abundant number, since it is smaller than the sum of its proper divisors (659780277954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640656211134 is a wasteful number, since it uses less digits than its factorization.

640656211134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593672239.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 640656211134 in words is "six hundred forty billion, six hundred fifty-six million, two hundred eleven thousand, one hundred thirty-four".