16668861 has 8 divisors (see below), whose sum is σ = 24245664. Its totient is φ = 10102320.

The previous prime is 16668853. The next prime is 16668887. The reversal of 16668861 is 16886661.

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

It is not a de Polignac number, because 16668861 - 2³ = 16668853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16668851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252526 + ... + 252591.

It is an arithmetic number, because the mean of its divisors is an integer number (3030708).

Almost surely, 2^16668861 is an apocalyptic number.

16668861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16668861 is a deficient number, since it is larger than the sum of its proper divisors (7576803).

16668861 is a wasteful number, since it uses less digits than its factorization.

16668861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505131.

The product of its digits is 82944, while the sum is 42.

The square root of 16668861 is about 4082.7516456429. The cubic root of 16668861 is about 255.4476872281.

The spelling of 16668861 in words is "sixteen million, six hundred sixty-eight thousand, eight hundred sixty-one".