1223645166 has 24 divisors (see below), whose sum is σ = 2654097264. Its totient is φ = 407440800.

The previous prime is 1223645147. The next prime is 1223645219. The reversal of 1223645166 is 6615463221.

1223645166 is a `hidden beast` number, since 1 + 2 + 2 + 3 + 645 + 1 + 6 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1223645166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19410 + ... + 53141.

It is an arithmetic number, because the mean of its divisors is an integer number (110587386).

Almost surely, 2^1223645166 is an apocalyptic number.

1223645166 is an abundant number, since it is smaller than the sum of its proper divisors (1430452098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1223645166 is a wasteful number, since it uses less digits than its factorization.

1223645166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73496 (or 73493 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1223645166 is about 34980.6398740789. The cubic root of 1223645166 is about 1069.5928709922.

The spelling of 1223645166 in words is "one billion, two hundred twenty-three million, six hundred forty-five thousand, one hundred sixty-six".