1640675818 has 8 divisors (see below), whose sum is σ = 2461192740. Its totient is φ = 820278240.

The previous prime is 1640675801. The next prime is 1640675819. The reversal of 1640675818 is 8185760461.

It can be written as a sum of positive squares in 2 ways, for example, as 1617085369 + 23590449 = 40213^2 + 4857^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1640675819) 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, 23868 + ... + 62056.

Almost surely, 2^1640675818 is an apocalyptic number.

1640675818 is a deficient number, since it is larger than the sum of its proper divisors (820516922).

1640675818 is a wasteful number, since it uses less digits than its factorization.

1640675818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59672.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 1640675818 is about 40505.2566712026. The cubic root of 1640675818 is about 1179.4356724149.

The spelling of 1640675818 in words is "one billion, six hundred forty million, six hundred seventy-five thousand, eight hundred eighteen".