220666251 has 8 divisors (see below), whose sum is σ = 316854160. Its totient is φ = 135794592.

The previous prime is 220666241. The next prime is 220666279. The reversal of 220666251 is 152666022.

220666251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 220666251 - 2⁷ = 220666123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220666241) 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, 2829016 + ... + 2829093.

It is an arithmetic number, because the mean of its divisors is an integer number (39606770).

Almost surely, 2^220666251 is an apocalyptic number.

220666251 is a deficient number, since it is larger than the sum of its proper divisors (96187909).

220666251 is a wasteful number, since it uses less digits than its factorization.

220666251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5658125.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 220666251 is about 14854.8393124934. The cubic root of 220666251 is about 604.2898582075.

The spelling of 220666251 in words is "two hundred twenty million, six hundred sixty-six thousand, two hundred fifty-one".