15666436345541 has 8 divisors (see below), whose sum is σ = 16033336784640. Its totient is φ = 15303777530272.

The previous prime is 15666436345531. The next prime is 15666436345607. The reversal of 15666436345541 is 14554363466651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15666436345541 - 2⁴² = 11268389834437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15666436345531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060398485 + ... + 1060413258.

It is an arithmetic number, because the mean of its divisors is an integer number (2004167098080).

Almost surely, 2^{15666436345541} is an apocalyptic number.

It is an amenable number.

15666436345541 is a deficient number, since it is larger than the sum of its proper divisors (366900439099).

15666436345541 is an equidigital number, since it uses as much as digits as its factorization.

15666436345541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120811915.

The product of its digits is 93312000, while the sum is 59.

The spelling of 15666436345541 in words is "fifteen trillion, six hundred sixty-six billion, four hundred thirty-six million, three hundred forty-five thousand, five hundred forty-one".