1666460977 has 2 divisors, whose sum is σ = 1666460978. Its totient is φ = 1666460976.

The previous prime is 1666460953. The next prime is 1666461029. The reversal of 1666460977 is 7790646661.

It is an a-pointer prime, because the next prime (1666461029) can be obtained adding 1666460977 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1246866721 + 419594256 = 35311^2 + 20484^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666460977 - 2¹⁹ = 1665936689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666460177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833230488 + 833230489.

It is an arithmetic number, because the mean of its divisors is an integer number (833230489).

Almost surely, 2^1666460977 is an apocalyptic number.

It is an amenable number.

1666460977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666460977 is an equidigital number, since it uses as much as digits as its factorization.

1666460977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 52.

The square root of 1666460977 is about 40822.3097950128. The cubic root of 1666460977 is about 1185.5823250769.

The spelling of 1666460977 in words is "one billion, six hundred sixty-six million, four hundred sixty thousand, nine hundred seventy-seven".