1778875061 has 2 divisors, whose sum is σ = 1778875062. Its totient is φ = 1778875060.

The previous prime is 1778875013. The next prime is 1778875067. The reversal of 1778875061 is 1605788771.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 959140900 + 819734161 = 30970^2 + 28631^2 .

It is a cyclic number.

It is not a de Polignac number, because 1778875061 - 2²² = 1774680757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1778875067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889437530 + 889437531.

It is an arithmetic number, because the mean of its divisors is an integer number (889437531).

Almost surely, 2^1778875061 is an apocalyptic number.

It is an amenable number.

1778875061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1778875061 is an equidigital number, since it uses as much as digits as its factorization.

1778875061 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 50.

The square root of 1778875061 is about 42176.7123066746. The cubic root of 1778875061 is about 1211.6629142866.

The spelling of 1778875061 in words is "one billion, seven hundred seventy-eight million, eight hundred seventy-five thousand, sixty-one".