105621161605 has 8 divisors (see below), whose sum is σ = 126761580792. Its totient is φ = 84486138048.

The previous prime is 105621161603. The next prime is 105621161623. The reversal of 105621161605 is 506161126501.

It can be written as a sum of positive squares in 4 ways, for example, as 1989962881 + 103631198724 = 44609^2 + 321918^2 .

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 105621161605 - 2¹ = 105621161603 is a prime.

It is a super-2 number, since 2×105621161605² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105621161603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1305714 + ... + 1384243.

It is an arithmetic number, because the mean of its divisors is an integer number (15845197599).

Almost surely, 2^105621161605 is an apocalyptic number.

It is an amenable number.

105621161605 is a deficient number, since it is larger than the sum of its proper divisors (21140419187).

105621161605 is an equidigital number, since it uses as much as digits as its factorization.

105621161605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2697815.

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 105621161605 in words is "one hundred five billion, six hundred twenty-one million, one hundred sixty-one thousand, six hundred five".