220451666 has 4 divisors (see below), whose sum is σ = 330677502. Its totient is φ = 110225832.

The previous prime is 220451657. The next prime is 220451681. The reversal of 220451666 is 666154022.

220451666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 196588441 + 23863225 = 14021^2 + 4885^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55112915 + ... + 55112918.

Almost surely, 2^220451666 is an apocalyptic number.

220451666 is a deficient number, since it is larger than the sum of its proper divisors (110225836).

220451666 is a wasteful number, since it uses less digits than its factorization.

220451666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110225835.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 220451666 is about 14847.6148252842. The cubic root of 220451666 is about 604.0939158526.

The spelling of 220451666 in words is "two hundred twenty million, four hundred fifty-one thousand, six hundred sixty-six".