1818497553 has 16 divisors (see below), whose sum is σ = 2540605056. Its totient is φ = 1154799360.

The previous prime is 1818497537. The next prime is 1818497557. The reversal of 1818497553 is 3557948181.

It is not a de Polignac number, because 1818497553 - 2⁴ = 1818497537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1818497496 and 1818497505.

It is not an unprimeable number, because it can be changed into a prime (1818497557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38050 + ... + 71307.

It is an arithmetic number, because the mean of its divisors is an integer number (158787816).

Almost surely, 2^1818497553 is an apocalyptic number.

It is an amenable number.

1818497553 is a deficient number, since it is larger than the sum of its proper divisors (722107503).

1818497553 is a wasteful number, since it uses less digits than its factorization.

1818497553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109624.

The product of its digits is 1209600, while the sum is 51.

The square root of 1818497553 is about 42643.8454293231. The cubic root of 1818497553 is about 1220.5930899770.

The spelling of 1818497553 in words is "one billion, eight hundred eighteen million, four hundred ninety-seven thousand, five hundred fifty-three".