2078477561 has 2 divisors, whose sum is σ = 2078477562. Its totient is φ = 2078477560.

The previous prime is 2078477549. The next prime is 2078477623. The reversal of 2078477561 is 1657748702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1775021161 + 303456400 = 42131^2 + 17420^2 .

It is a cyclic number.

It is not a de Polignac number, because 2078477561 - 2¹⁰ = 2078476537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2078477161) by changing a digit.

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 as a sum of consecutive naturals, namely, 1039238780 + 1039238781.

It is an arithmetic number, because the mean of its divisors is an integer number (1039238781).

Almost surely, 2^2078477561 is an apocalyptic number.

It is an amenable number.

2078477561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2078477561 is an equidigital number, since it uses as much as digits as its factorization.

2078477561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 658560, while the sum is 47.

The square root of 2078477561 is about 45590.3231069928. The cubic root of 2078477561 is about 1276.1893422983.

The spelling of 2078477561 in words is "two billion, seventy-eight million, four hundred seventy-seven thousand, five hundred sixty-one".