105661520011 has 4 divisors (see below), whose sum is σ = 105743493000. Its totient is φ = 105579547024.

The previous prime is 105661519991. The next prime is 105661520017. The reversal of 105661520011 is 110025166501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110025166501 = 443 ⋅248363807.

It is a cyclic number.

It is not a de Polignac number, because 105661520011 - 2⁵ = 105661519979 is a prime.

It is a super-2 number, since 2×105661520011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105661520017) 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, 40984561 + ... + 40987138.

It is an arithmetic number, because the mean of its divisors is an integer number (26435873250).

Almost surely, 2^105661520011 is an apocalyptic number.

105661520011 is a deficient number, since it is larger than the sum of its proper divisors (81972989).

105661520011 is an equidigital number, since it uses as much as digits as its factorization.

105661520011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81972988.

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 105661520011 its reverse (110025166501), we get a palindrome (215686686512).

The spelling of 105661520011 in words is "one hundred five billion, six hundred sixty-one million, five hundred twenty thousand, eleven".