4361721845 has 24 divisors (see below), whose sum is σ = 5700609576. Its totient is φ = 3202238208.

The previous prime is 4361721839. The next prime is 4361721853. The reversal of 4361721845 is 5481271634.

It can be written as a sum of positive squares in 12 ways, for example, as 2694959569 + 1666762276 = 51913^2 + 40826^2 .

It is not a de Polignac number, because 4361721845 - 2¹⁴ = 4361705461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131267 + ... + 161103.

It is an arithmetic number, because the mean of its divisors is an integer number (237525399).

Almost surely, 2^4361721845 is an apocalyptic number.

It is an amenable number.

4361721845 is a deficient number, since it is larger than the sum of its proper divisors (1338887731).

4361721845 is a wasteful number, since it uses less digits than its factorization.

4361721845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30041 (or 30028 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 4361721845 is about 66043.3330851798. Note that the first 3 decimals coincide. The cubic root of 4361721845 is about 1633.8768602268.

The spelling of 4361721845 in words is "four billion, three hundred sixty-one million, seven hundred twenty-one thousand, eight hundred forty-five".