1618198820 has 24 divisors (see below), whose sum is σ = 3883677504. Its totient is φ = 554810976.

The previous prime is 1618198781. The next prime is 1618198837. The reversal of 1618198820 is 288918161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5779142 + ... + 5779421.

It is an arithmetic number, because the mean of its divisors is an integer number (161819896).

Almost surely, 2^1618198820 is an apocalyptic number.

1618198820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1618198820 is an abundant number, since it is smaller than the sum of its proper divisors (2265478684).

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

1618198820 is a wasteful number, since it uses less digits than its factorization.

1618198820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11558579 (or 11558577 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 44.

The square root of 1618198820 is about 40226.8420336471. The cubic root of 1618198820 is about 1174.0248604835.

The spelling of 1618198820 in words is "one billion, six hundred eighteen million, one hundred ninety-eight thousand, eight hundred twenty".