16661331958 has 8 divisors (see below), whose sum is σ = 25011211680. Its totient is φ = 8324261400.

The previous prime is 16661331949. The next prime is 16661331989. The reversal of 16661331958 is 85913316661.

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

It is a super-2 number, since 2×16661331958² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3199038 + ... + 3204241.

It is an arithmetic number, because the mean of its divisors is an integer number (3126401460).

Almost surely, 2^16661331958 is an apocalyptic number.

16661331958 is a deficient number, since it is larger than the sum of its proper divisors (8349879722).

16661331958 is a wasteful number, since it uses less digits than its factorization.

16661331958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6404582.

The product of its digits is 699840, while the sum is 49.

The spelling of 16661331958 in words is "sixteen billion, six hundred sixty-one million, three hundred thirty-one thousand, nine hundred fifty-eight".