1606121018 has 4 divisors (see below), whose sum is σ = 2409181530. Its totient is φ = 803060508.

The previous prime is 1606121017. The next prime is 1606121047. The reversal of 1606121018 is 8101216061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8101216061 = 2389 ⋅3391049.

It can be written as a sum of positive squares in only one way, i.e., 947839369 + 658281649 = 30787^2 + 25657^2 .

It is a super-2 number, since 2×1606121018² = 5159249448922712648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1606121017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401530253 + ... + 401530256.

Almost surely, 2^1606121018 is an apocalyptic number.

1606121018 is a deficient number, since it is larger than the sum of its proper divisors (803060512).

1606121018 is an equidigital number, since it uses as much as digits as its factorization.

1606121018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803060511.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 1606121018 is about 40076.4396871778. The cubic root of 1606121018 is about 1171.0966944428.

Adding to 1606121018 its reverse (8101216061), we get a palindrome (9707337079).

The spelling of 1606121018 in words is "one billion, six hundred six million, one hundred twenty-one thousand, eighteen".