1664629886 has 8 divisors (see below), whose sum is σ = 2497967640. Its totient is φ = 831974008.

The previous prime is 1664629867. The next prime is 1664629921. The reversal of 1664629886 is 6889264661.

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

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 164321 + ... + 174156.

It is an arithmetic number, because the mean of its divisors is an integer number (312245955).

Almost surely, 2^1664629886 is an apocalyptic number.

1664629886 is a deficient number, since it is larger than the sum of its proper divisors (833337754).

1664629886 is a wasteful number, since it uses less digits than its factorization.

1664629886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340938.

The product of its digits is 5971968, while the sum is 56.

The square root of 1664629886 is about 40799.8760537333. The cubic root of 1664629886 is about 1185.1479305195.

The spelling of 1664629886 in words is "one billion, six hundred sixty-four million, six hundred twenty-nine thousand, eight hundred eighty-six".