1666331063 has 2 divisors, whose sum is σ = 1666331064. Its totient is φ = 1666331062.

The previous prime is 1666330987. The next prime is 1666331113. The reversal of 1666331063 is 3601336661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666331063 - 2¹² = 1666326967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666331263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833165531 + 833165532.

It is an arithmetic number, because the mean of its divisors is an integer number (833165532).

Almost surely, 2^1666331063 is an apocalyptic number.

1666331063 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666331063 is an equidigital number, since it uses as much as digits as its factorization.

1666331063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 35.

The square root of 1666331063 is about 40820.7185507556. The cubic root of 1666331063 is about 1185.5515157256.

The spelling of 1666331063 in words is "one billion, six hundred sixty-six million, three hundred thirty-one thousand, sixty-three".