1818824645 has 32 divisors (see below), whose sum is σ = 2524763520. Its totient is φ = 1243146240.

The previous prime is 1818824599. The next prime is 1818824671. The reversal of 1818824645 is 5464288181.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1818824645 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1818824645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1054754 + ... + 1056476.

It is an arithmetic number, because the mean of its divisors is an integer number (78898860).

Almost surely, 2^1818824645 is an apocalyptic number.

It is an amenable number.

1818824645 is a deficient number, since it is larger than the sum of its proper divisors (705938875).

1818824645 is a wasteful number, since it uses less digits than its factorization.

1818824645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885.

The product of its digits is 491520, while the sum is 47.

The square root of 1818824645 is about 42647.6804175796. The cubic root of 1818824645 is about 1220.6662680244. Note that the first 3 decimals are identical.

The spelling of 1818824645 in words is "one billion, eight hundred eighteen million, eight hundred twenty-four thousand, six hundred forty-five".