640266541266 has 32 divisors (see below), whose sum is σ = 1470468614400. Its totient is φ = 183808576080.

The previous prime is 640266541259. The next prime is 640266541297. The reversal of 640266541266 is 662145662046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255288436 + ... + 255290943.

It is an arithmetic number, because the mean of its divisors is an integer number (45952144200).

Almost surely, 2^640266541266 is an apocalyptic number.

640266541266 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

640266541266 is an abundant number, since it is smaller than the sum of its proper divisors (830202073134).

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

640266541266 is a wasteful number, since it uses less digits than its factorization.

640266541266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510579414.

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 640266541266 in words is "six hundred forty billion, two hundred sixty-six million, five hundred forty-one thousand, two hundred sixty-six".