16668855 has 64 divisors (see below), whose sum is σ = 35020800. Its totient is φ = 7361280.

The previous prime is 16668853. The next prime is 16668887. The reversal of 16668855 is 55886661.

It is not a de Polignac number, because 16668855 - 2¹ = 16668853 is a prime.

It is a super-2 number, since 2×16668855² = 555701454022050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16668855.

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 63 ways as a sum of consecutive naturals, for example, 29011 + ... + 29579.

It is an arithmetic number, because the mean of its divisors is an integer number (547200).

Almost surely, 2^16668855 is an apocalyptic number.

16668855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16668855 is an abundant number, since it is smaller than the sum of its proper divisors (18351945).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16668855 is a wasteful number, since it uses less digits than its factorization.

16668855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621 (or 615 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 16668855 is about 4082.7509108443. The cubic root of 16668855 is about 255.4476565784.

The spelling of 16668855 in words is "sixteen million, six hundred sixty-eight thousand, eight hundred fifty-five".