641644446146 has 16 divisors (see below), whose sum is σ = 1055460837888. Its totient is φ = 290129566800.

The previous prime is 641644446143. The next prime is 641644446187.

641644446146 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 641644446094 and 641644446103.

It is not an unprimeable number, because it can be changed into a prime (641644446143) 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, 76345685 + ... + 76354088.

It is an arithmetic number, because the mean of its divisors is an integer number (65966302368).

Almost surely, 2^641644446146 is an apocalyptic number.

641644446146 is a deficient number, since it is larger than the sum of its proper divisors (413816391742).

641644446146 is a wasteful number, since it uses less digits than its factorization.

641644446146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152699977.

The product of its digits is 5308416, while the sum is 50.

The spelling of 641644446146 in words is "six hundred forty-one billion, six hundred forty-four million, four hundred forty-six thousand, one hundred forty-six".