1641343664 has 20 divisors (see below), whose sum is σ = 3318369456. Its totient is φ = 784990272.

The previous prime is 1641343663. The next prime is 1641343681. The reversal of 1641343664 is 4663431461.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1641343661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2229719 + ... + 2230454.

Almost surely, 2^1641343664 is an apocalyptic number.

It is an amenable number.

1641343664 is an abundant number, since it is smaller than the sum of its proper divisors (1677025792).

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

1641343664 is a wasteful number, since it uses less digits than its factorization.

1641343664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4460204 (or 4460198 counting only the distinct ones).

The product of its digits is 124416, while the sum is 38.

The square root of 1641343664 is about 40513.4997747664. The cubic root of 1641343664 is about 1179.5956826040.

The spelling of 1641343664 in words is "one billion, six hundred forty-one million, three hundred forty-three thousand, six hundred sixty-four".