105666155521 has 8 divisors (see below), whose sum is σ = 106383326400. Its totient is φ = 104949091632.

The previous prime is 105666155489. The next prime is 105666155603. The reversal of 105666155521 is 125551666501.

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 105666155521 - 2⁵ = 105666155489 is a prime.

It is a super-2 number, since 2×105666155521² (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 (105666155821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3735196 + ... + 3763378.

It is an arithmetic number, because the mean of its divisors is an integer number (13297915800).

Almost surely, 2^105666155521 is an apocalyptic number.

It is an amenable number.

105666155521 is a deficient number, since it is larger than the sum of its proper divisors (717170879).

105666155521 is a wasteful number, since it uses less digits than its factorization.

105666155521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53495.

The product of its (nonzero) digits is 270000, while the sum is 43.

The spelling of 105666155521 in words is "one hundred five billion, six hundred sixty-six million, one hundred fifty-five thousand, five hundred twenty-one".