1816604641 has 4 divisors (see below), whose sum is σ = 1830471984. Its totient is φ = 1802737300.

The previous prime is 1816604639. The next prime is 1816604659. The reversal of 1816604641 is 1464066181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1816604641 - 2¹ = 1816604639 is a prime.

It is a super-4 number, since 4×1816604641⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1816604641.

It is not an unprimeable number, because it can be changed into a prime (1816601641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6933475 + ... + 6933736.

It is an arithmetic number, because the mean of its divisors is an integer number (457617996).

Almost surely, 2^1816604641 is an apocalyptic number.

It is an amenable number.

1816604641 is a deficient number, since it is larger than the sum of its proper divisors (13867343).

1816604641 is a wasteful number, since it uses less digits than its factorization.

1816604641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13867342.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 1816604641 is about 42621.6452169552. The cubic root of 1816604641 is about 1220.1694293492.

The spelling of 1816604641 in words is "one billion, eight hundred sixteen million, six hundred four thousand, six hundred forty-one".