105561010605509 has 4 divisors (see below), whose sum is σ = 105573272318220. Its totient is φ = 105548748892800.

The previous prime is 105561010605497. The next prime is 105561010605527. The reversal of 105561010605509 is 905506010165501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30970582874884 + 74590427730625 = 5565122^2 + 8636575^2 .

It is a cyclic number.

It is not a de Polignac number, because 105561010605509 - 2²⁴ = 105560993828293 is a prime.

It is a super-2 number, since 2×105561010605509² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 105561010605509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105561010605539) 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, 6130843442 + ... + 6130860659.

It is an arithmetic number, because the mean of its divisors is an integer number (26393318079555).

Almost surely, 2^{105561010605509} is an apocalyptic number.

It is an amenable number.

105561010605509 is a deficient number, since it is larger than the sum of its proper divisors (12261712711).

105561010605509 is an equidigital number, since it uses as much as digits as its factorization.

105561010605509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12261712710.

The product of its (nonzero) digits is 202500, while the sum is 44.

The spelling of 105561010605509 in words is "one hundred five trillion, five hundred sixty-one billion, ten million, six hundred five thousand, five hundred nine".