1866350221 has 8 divisors (see below), whose sum is σ = 1967796320. Its totient is φ = 1765225872.

The previous prime is 1866350209. The next prime is 1866350237. The reversal of 1866350221 is 1220536681.

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

It is a cyclic number.

It is not a de Polignac number, because 1866350221 - 2⁷ = 1866350093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866350251) 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, 68475 + ... + 91768.

It is an arithmetic number, because the mean of its divisors is an integer number (245974540).

Almost surely, 2^1866350221 is an apocalyptic number.

It is an amenable number.

1866350221 is a deficient number, since it is larger than the sum of its proper divisors (101446099).

1866350221 is a wasteful number, since it uses less digits than its factorization.

1866350221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160875.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1866350221 is about 43201.2756871831. The cubic root of 1866350221 is about 1231.2069192035.

The spelling of 1866350221 in words is "one billion, eight hundred sixty-six million, three hundred fifty thousand, two hundred twenty-one".