1666546433 has 2 divisors, whose sum is σ = 1666546434. Its totient is φ = 1666546432.

The previous prime is 1666546429. The next prime is 1666546457. The reversal of 1666546433 is 3346456661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1568793664 + 97752769 = 39608^2 + 9887^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666546433 - 2² = 1666546429 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666546403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833273216 + 833273217.

It is an arithmetic number, because the mean of its divisors is an integer number (833273217).

Almost surely, 2^1666546433 is an apocalyptic number.

It is an amenable number.

1666546433 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666546433 is an equidigital number, since it uses as much as digits as its factorization.

1666546433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 44.

The square root of 1666546433 is about 40823.3564641615. The cubic root of 1666546433 is about 1185.6025902561.

The spelling of 1666546433 in words is "one billion, six hundred sixty-six million, five hundred forty-six thousand, four hundred thirty-three".