1641278818 has 16 divisors (see below), whose sum is σ = 2542337280. Its totient is φ = 793854000.

The previous prime is 1641278803. The next prime is 1641278851. The reversal of 1641278818 is 8188721461.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 265968 + ... + 272068.

It is an arithmetic number, because the mean of its divisors is an integer number (158896080).

Almost surely, 2^1641278818 is an apocalyptic number.

1641278818 is a deficient number, since it is larger than the sum of its proper divisors (901058462).

1641278818 is a wasteful number, since it uses less digits than its factorization.

1641278818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10473.

The product of its digits is 172032, while the sum is 46.

The square root of 1641278818 is about 40512.6994657231. The cubic root of 1641278818 is about 1179.5801479599.

The spelling of 1641278818 in words is "one billion, six hundred forty-one million, two hundred seventy-eight thousand, eight hundred eighteen".