105666050521 has 4 divisors (see below), whose sum is σ = 105671171200. Its totient is φ = 105660929844.

The previous prime is 105666050491. The next prime is 105666050569. The reversal of 105666050521 is 125050666501.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125050666501 = 389 ⋅321467009.

It is a cyclic number.

It is not a de Polignac number, because 105666050521 - 2¹¹ = 105666048473 is a prime.

It is a super-2 number, since 2×105666050521² (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 (105666750521) 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, 2529261 + ... + 2570698.

It is an arithmetic number, because the mean of its divisors is an integer number (26417792800).

Almost surely, 2^105666050521 is an apocalyptic number.

It is an amenable number.

105666050521 is a deficient number, since it is larger than the sum of its proper divisors (5120679).

105666050521 is an equidigital number, since it uses as much as digits as its factorization.

105666050521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5120678.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 105666050521 in words is "one hundred five billion, six hundred sixty-six million, fifty thousand, five hundred twenty-one".