1641438668 has 12 divisors (see below), whose sum is σ = 2900959152. Its totient is φ = 812593200.

The previous prime is 1641438661. The next prime is 1641438703. The reversal of 1641438668 is 8668341461.

It is a super-2 number, since 2×1641438668² = 5388641801611228448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1641438661) 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 3 ways as a sum of consecutive naturals, for example, 2031080 + ... + 2031887.

It is an arithmetic number, because the mean of its divisors is an integer number (241746596).

Almost surely, 2^1641438668 is an apocalyptic number.

It is an amenable number.

1641438668 is a deficient number, since it is larger than the sum of its proper divisors (1259520484).

1641438668 is a wasteful number, since it uses less digits than its factorization.

1641438668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4063072 (or 4063070 counting only the distinct ones).

The product of its digits is 663552, while the sum is 47.

The square root of 1641438668 is about 40514.6722558631. The cubic root of 1641438668 is about 1179.6184412231.

The spelling of 1641438668 in words is "one billion, six hundred forty-one million, four hundred thirty-eight thousand, six hundred sixty-eight".