1813168356 has 12 divisors (see below), whose sum is σ = 4230726192. Its totient is φ = 604389448.

The previous prime is 1813168349. The next prime is 1813168367. The reversal of 1813168356 is 6538613181.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

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, 75548670 + ... + 75548693.

It is an arithmetic number, because the mean of its divisors is an integer number (352560516).

Almost surely, 2^1813168356 is an apocalyptic number.

It is an amenable number.

1813168356 is an abundant number, since it is smaller than the sum of its proper divisors (2417557836).

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

1813168356 is a wasteful number, since it uses less digits than its factorization.

1813168356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151097370 (or 151097368 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 1813168356 is about 42581.3146344732. The cubic root of 1813168356 is about 1219.3995872084.

The spelling of 1813168356 in words is "one billion, eight hundred thirteen million, one hundred sixty-eight thousand, three hundred fifty-six".