1661667226 has 8 divisors (see below), whose sum is σ = 2492714304. Its totient is φ = 830762460.

The previous prime is 1661667191. The next prime is 1661667247. The reversal of 1661667226 is 6227661661.

It is a happy number.

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

It is a super-2 number, since 2×1661667226² = 5522275939925070152, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1231 + ... + 57661.

It is an arithmetic number, because the mean of its divisors is an integer number (311589288).

Almost surely, 2^1661667226 is an apocalyptic number.

1661667226 is a deficient number, since it is larger than the sum of its proper divisors (831047078).

1661667226 is a wasteful number, since it uses less digits than its factorization.

1661667226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71156.

The product of its digits is 217728, while the sum is 43.

The square root of 1661667226 is about 40763.5526665672. The cubic root of 1661667226 is about 1184.4444156826. Note that the first 4 decimals are identical.

The spelling of 1661667226 in words is "one billion, six hundred sixty-one million, six hundred sixty-seven thousand, two hundred twenty-six".