5541821765 has 4 divisors (see below), whose sum is σ = 6650186124. Its totient is φ = 4433457408.

The previous prime is 5541821741. The next prime is 5541821777. The reversal of 5541821765 is 5671281455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3647918404 + 1893903361 = 60398^2 + 43519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5541821765 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554182172 + ... + 554182181.

It is an arithmetic number, because the mean of its divisors is an integer number (1662546531).

Almost surely, 2^5541821765 is an apocalyptic number.

It is an amenable number.

5541821765 is a deficient number, since it is larger than the sum of its proper divisors (1108364359).

5541821765 is a wasteful number, since it uses less digits than its factorization.

5541821765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108364358.

The product of its digits is 336000, while the sum is 44.

The square root of 5541821765 is about 74443.4131740344. The cubic root of 5541821765 is about 1769.6369780150.

The spelling of 5541821765 in words is "five billion, five hundred forty-one million, eight hundred twenty-one thousand, seven hundred sixty-five".