2078105561 has 4 divisors (see below), whose sum is σ = 2374977792. Its totient is φ = 1781233332.

The previous prime is 2078105543. The next prime is 2078105569. The reversal of 2078105561 is 1655018702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1655018702 = 2 ⋅827509351.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2078105561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2078105569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148436105 + ... + 148436118.

It is an arithmetic number, because the mean of its divisors is an integer number (593744448).

Almost surely, 2^2078105561 is an apocalyptic number.

It is an amenable number.

2078105561 is a deficient number, since it is larger than the sum of its proper divisors (296872231).

2078105561 is an equidigital number, since it uses as much as digits as its factorization.

2078105561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296872230.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 2078105561 is about 45586.2431112721. The cubic root of 2078105561 is about 1276.1132015098.

The spelling of 2078105561 in words is "two billion, seventy-eight million, one hundred five thousand, five hundred sixty-one".