15805141661 has 4 divisors (see below), whose sum is σ = 15807366432. Its totient is φ = 15802916892.

The previous prime is 15805141643. The next prime is 15805141673. The reversal of 15805141661 is 16614150851.

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 15805141661 - 2²⁶ = 15738032797 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 (15805141861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1101695 + ... + 1115948.

It is an arithmetic number, because the mean of its divisors is an integer number (3951841608).

Almost surely, 2^15805141661 is an apocalyptic number.

It is an amenable number.

15805141661 is a deficient number, since it is larger than the sum of its proper divisors (2224771).

15805141661 is an equidigital number, since it uses as much as digits as its factorization.

15805141661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224770.

The product of its (nonzero) digits is 28800, while the sum is 38.

The spelling of 15805141661 in words is "fifteen billion, eight hundred five million, one hundred forty-one thousand, six hundred sixty-one".