11565661450001 has 4 divisors (see below), whose sum is σ = 11964477362100. Its totient is φ = 11166845537904.

The previous prime is 11565661449959. The next prime is 11565661450009. The reversal of 11565661450001 is 10005416656511.

It is a happy number.

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 3644949180625 + 7920712269376 = 1909175^2 + 2814376^2 .

It is a cyclic number.

It is not a de Polignac number, because 11565661450001 - 2¹⁰ = 11565661448977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11565661450009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199407956006 + ... + 199407956063.

It is an arithmetic number, because the mean of its divisors is an integer number (2991119340525).

Almost surely, 2^{11565661450001} is an apocalyptic number.

It is an amenable number.

11565661450001 is a deficient number, since it is larger than the sum of its proper divisors (398815912099).

11565661450001 is an equidigital number, since it uses as much as digits as its factorization.

11565661450001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398815912098.

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 11565661450001 in words is "eleven trillion, five hundred sixty-five billion, six hundred sixty-one million, four hundred fifty thousand, one".