1641600018 has 24 divisors (see below), whose sum is σ = 3566721600. Its totient is φ = 545673624.

The previous prime is 1641600001. The next prime is 1641600029. The reversal of 1641600018 is 8100061461.

1641600018 is a `hidden beast` number, since 1 + 6 + 41 + 600 + 0 + 18 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1641599964 and 1641600000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120558 + ... + 133481.

It is an arithmetic number, because the mean of its divisors is an integer number (148613400).

Almost surely, 2^1641600018 is an apocalyptic number.

1641600018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1641600018 is an abundant number, since it is smaller than the sum of its proper divisors (1925121582).

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

1641600018 is a wasteful number, since it uses less digits than its factorization.

1641600018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254406 (or 254403 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1641600018 is about 40516.6634608527. The cubic root of 1641600018 is about 1179.6570913015.

Adding to 1641600018 its reverse (8100061461), we get a palindrome (9741661479).

The spelling of 1641600018 in words is "one billion, six hundred forty-one million, six hundred thousand, eighteen".