1845665481 has 16 divisors (see below), whose sum is σ = 2735259840. Its totient is φ = 1097478720.

The previous prime is 1845665461. The next prime is 1845665489.

1845665481 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1845665481 - 2²¹ = 1843568329 is a prime.

It is a super-2 number, since 2×1845665481² = 6812962135509922722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1845665481.

It is not an unprimeable number, because it can be changed into a prime (1845665489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 525886 + ... + 529383.

It is an arithmetic number, because the mean of its divisors is an integer number (170953740).

Almost surely, 2^1845665481 is an apocalyptic number.

1845665481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1845665481 is a deficient number, since it is larger than the sum of its proper divisors (889594359).

1845665481 is a wasteful number, since it uses less digits than its factorization.

1845665481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055336.

The product of its digits is 921600, while the sum is 48.

The square root of 1845665481 is about 42961.2090262832. The cubic root of 1845665481 is about 1226.6415268933.

It can be divided in two parts, 184 and 5665481, that added together give a palindrome (5665665).

The spelling of 1845665481 in words is "one billion, eight hundred forty-five million, six hundred sixty-five thousand, four hundred eighty-one".