15641383805 has 6 divisors (see below), whose sum is σ = 18769996158. Its totient is φ = 12512883320.

The previous prime is 15641383801. The next prime is 15641383837. The reversal of 15641383805 is 50838314651.

It can be written as a sum of positive squares in only one way, i.e., 12513107044 + 3128276761 = 111862^2 + 55931^2 .

It is not a de Polignac number, because 15641383805 - 2² = 15641383801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15641383801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 251690 + ... + 307620.

It is an arithmetic number, because the mean of its divisors is an integer number (3128332693).

Almost surely, 2^15641383805 is an apocalyptic number.

It is an amenable number.

15641383805 is a deficient number, since it is larger than the sum of its proper divisors (3128612353).

15641383805 is an frugal number, since it uses more digits than its factorization.

15641383805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111867 (or 55936 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 15641383805 in words is "fifteen billion, six hundred forty-one million, three hundred eighty-three thousand, eight hundred five".