1666260077 has 2 divisors, whose sum is σ = 1666260078. Its totient is φ = 1666260076.

The previous prime is 1666260073. The next prime is 1666260107. The reversal of 1666260077 is 7700626661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1665782596 + 477481 = 40814^2 + 691^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666260077 - 2² = 1666260073 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666260073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833130038 + 833130039.

It is an arithmetic number, because the mean of its divisors is an integer number (833130039).

Almost surely, 2^1666260077 is an apocalyptic number.

It is an amenable number.

1666260077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666260077 is an equidigital number, since it uses as much as digits as its factorization.

1666260077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 1666260077 is about 40819.8490565558. The cubic root of 1666260077 is about 1185.5346805846.

The spelling of 1666260077 in words is "one billion, six hundred sixty-six million, two hundred sixty thousand, seventy-seven".