105665556545 has 8 divisors (see below), whose sum is σ = 126817374696. Its totient is φ = 84519974016.

The previous prime is 105665556517. The next prime is 105665556547. The reversal of 105665556545 is 545655566501.

It can be written as a sum of positive squares in 4 ways, for example, as 16353038641 + 89312517904 = 127879^2 + 298852^2 .

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 105665556545 - 2⁸ = 105665556289 is a prime.

It is a super-2 number, since 2×105665556545² (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 (105665556547) 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, 1521542 + ... + 1589471.

It is an arithmetic number, because the mean of its divisors is an integer number (15852171837).

Almost surely, 2^105665556545 is an apocalyptic number.

It is an amenable number.

105665556545 is a deficient number, since it is larger than the sum of its proper divisors (21151818151).

105665556545 is an equidigital number, since it uses as much as digits as its factorization.

105665556545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117811.

The product of its (nonzero) digits is 13500000, while the sum is 53.

The spelling of 105665556545 in words is "one hundred five billion, six hundred sixty-five million, five hundred fifty-six thousand, five hundred forty-five".