640126201056 has 48 divisors (see below), whose sum is σ = 1680502981248. Its totient is φ = 213353596800.

The previous prime is 640126201051. The next prime is 640126201081. The reversal of 640126201056 is 650102621046.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640126201051) 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 7 ways as a sum of consecutive naturals, for example, 617661 + ... + 1289091.

It is an arithmetic number, because the mean of its divisors is an integer number (35010478776).

Almost surely, 2^640126201056 is an apocalyptic number.

It is an amenable number.

640126201056 is an abundant number, since it is smaller than the sum of its proper divisors (1040376780192).

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

640126201056 is a wasteful number, since it uses less digits than its factorization.

640126201056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681375 (or 681367 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 640126201056 in words is "six hundred forty billion, one hundred twenty-six million, two hundred one thousand, fifty-six".