1818315556 has 6 divisors (see below), whose sum is σ = 3182052230. Its totient is φ = 909157776.

The previous prime is 1818315553. The next prime is 1818315559. The reversal of 1818315556 is 6555138181.

It is an interprime number because it is at equal distance from previous prime (1818315553) and next prime (1818315559).

It can be written as a sum of positive squares in only one way, i.e., 1709822500 + 108493056 = 41350^2 + 10416^2 .

It is a super-2 number, since 2×1818315556² = 6612542922383178272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1818315553) by changing a digit.

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 as a sum of consecutive naturals, namely, 227289441 + ... + 227289448.

Almost surely, 2^1818315556 is an apocalyptic number.

It is an amenable number.

1818315556 is a deficient number, since it is larger than the sum of its proper divisors (1363736674).

1818315556 is a wasteful number, since it uses less digits than its factorization.

1818315556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454578893 (or 454578891 counting only the distinct ones).

The product of its digits is 144000, while the sum is 43.

The square root of 1818315556 is about 42641.7114572105. The cubic root of 1818315556 is about 1220.5523692382.

The spelling of 1818315556 in words is "one billion, eight hundred eighteen million, three hundred fifteen thousand, five hundred fifty-six".