61005605105 has 4 divisors (see below), whose sum is σ = 73206726132. Its totient is φ = 48804484080.

The previous prime is 61005605077. The next prime is 61005605117. The reversal of 61005605105 is 50150650016.

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 30528476176 + 30477128929 = 174724^2 + 174577^2 .

It is not a de Polignac number, because 61005605105 - 2⁶ = 61005605041 is a prime.

It is a super-2 number, since 2×61005605105² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6100560506 + ... + 6100560515.

It is an arithmetic number, because the mean of its divisors is an integer number (18301681533).

Almost surely, 2^61005605105 is an apocalyptic number.

It is an amenable number.

61005605105 is a deficient number, since it is larger than the sum of its proper divisors (12201121027).

61005605105 is a wasteful number, since it uses less digits than its factorization.

61005605105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12201121026.

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 61005605105 in words is "sixty-one billion, five million, six hundred five thousand, one hundred five".