640126165255 has 8 divisors (see below), whose sum is σ = 768161416032. Its totient is φ = 512094253728.

The previous prime is 640126165243. The next prime is 640126165297. The reversal of 640126165255 is 552561621046.

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-640126165255 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 391692 + ... + 1197361.

It is an arithmetic number, because the mean of its divisors is an integer number (96020177004).

Almost surely, 2^640126165255 is an apocalyptic number.

640126165255 is a deficient number, since it is larger than the sum of its proper divisors (128035250777).

640126165255 is a wasteful number, since it uses less digits than its factorization.

640126165255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669625.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 640126165255 in words is "six hundred forty billion, one hundred twenty-six million, one hundred sixty-five thousand, two hundred fifty-five".