641556222655146 has 64 divisors (see below), whose sum is σ = 1345847297384448. Its totient is φ = 203642490616128.

The previous prime is 641556222655141. The next prime is 641556222655147.

641556222655146 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 641556222655146.

It is not an unprimeable number, because it can be changed into a prime (641556222655141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 865891681 + ... + 866632283.

It is an arithmetic number, because the mean of its divisors is an integer number (21028864021632).

Almost surely, 2^{641556222655146} is an apocalyptic number.

641556222655146 is an abundant number, since it is smaller than the sum of its proper divisors (704291074729302).

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

641556222655146 is a wasteful number, since it uses less digits than its factorization.

641556222655146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823715.

The product of its digits is 103680000, while the sum is 60.

The spelling of 641556222655146 in words is "six hundred forty-one trillion, five hundred fifty-six billion, two hundred twenty-two million, six hundred fifty-five thousand, one hundred forty-six".