1819655166 has 128 divisors (see below), whose sum is σ = 4510826496. Its totient is φ = 478114560.

The previous prime is 1819655147. The next prime is 1819655177. The reversal of 1819655166 is 6615569181.

It is a super-2 number, since 2×1819655166² = 6622289846300975112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2948890 + ... + 2949506.

It is an arithmetic number, because the mean of its divisors is an integer number (35240832).

Almost surely, 2^1819655166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1819655166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2255413248).

1819655166 is an abundant number, since it is smaller than the sum of its proper divisors (2691171330).

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

1819655166 is a wasteful number, since it uses less digits than its factorization.

1819655166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766.

The product of its digits is 388800, while the sum is 48.

The square root of 1819655166 is about 42657.4163071323. The cubic root of 1819655166 is about 1220.8520353740.

The spelling of 1819655166 in words is "one billion, eight hundred nineteen million, six hundred fifty-five thousand, one hundred sixty-six".