200121666 has 16 divisors (see below), whose sum is σ = 417645504. Its totient is φ = 63806864.

The previous prime is 200121653. The next prime is 200121673. The reversal of 200121666 is 666121002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724941 + ... + 725216.

It is an arithmetic number, because the mean of its divisors is an integer number (26102844).

Almost surely, 2^200121666 is an apocalyptic number.

200121666 is an abundant number, since it is smaller than the sum of its proper divisors (217523838).

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

200121666 is a wasteful number, since it uses less digits than its factorization.

200121666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450185.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 200121666 is about 14146.4365124225. The cubic root of 200121666 is about 584.9221081186.

Adding to 200121666 its reverse (666121002), we get a palindrome (866242668).

The spelling of 200121666 in words is "two hundred million, one hundred twenty-one thousand, six hundred sixty-six".