1620666226 has 8 divisors (see below), whose sum is σ = 2431186524. Its totient is φ = 810270720.

The previous prime is 1620666197. The next prime is 1620666233. The reversal of 1620666226 is 6226660261.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1548501201 + 72165025 = 39351^2 + 8495^2 .

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

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, 14886 + ... + 58846.

Almost surely, 2^1620666226 is an apocalyptic number.

1620666226 is a deficient number, since it is larger than the sum of its proper divisors (810520298).

1620666226 is a wasteful number, since it uses less digits than its factorization.

1620666226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62396.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 1620666226 is about 40257.4990032913. The cubic root of 1620666226 is about 1174.6212694588.

The spelling of 1620666226 in words is "one billion, six hundred twenty million, six hundred sixty-six thousand, two hundred twenty-six".