641634166655556 has 48 divisors (see below), whose sum is σ = 1519503696172224. Its totient is φ = 210684204251136.

The previous prime is 641634166655551. The next prime is 641634166655557. The reversal of 641634166655556 is 655556661436146.

It is a super-2 number, since 2×641634166655556² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641634166655551) by changing a digit.

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, 102371476 + ... + 108458228.

It is an arithmetic number, because the mean of its divisors is an integer number (31656327003588).

Almost surely, 2^{641634166655556} is an apocalyptic number.

It is an amenable number.

641634166655556 is an abundant number, since it is smaller than the sum of its proper divisors (877869529516668).

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

641634166655556 is a wasteful number, since it uses less digits than its factorization.

641634166655556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6217940 (or 6217938 counting only the distinct ones).

The product of its digits is 1399680000, while the sum is 69.

The spelling of 641634166655556 in words is "six hundred forty-one trillion, six hundred thirty-four billion, one hundred sixty-six million, six hundred fifty-five thousand, five hundred fifty-six".