1666614461 has 2 divisors, whose sum is σ = 1666614462. Its totient is φ = 1666614460.

The previous prime is 1666614457. The next prime is 1666614463. The reversal of 1666614461 is 1644166661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1460691961 + 205922500 = 38219^2 + 14350^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666614461 - 2² = 1666614457 is a prime.

It is a super-2 number, since 2×1666614461² = 5555207523228641042, which contains 22 as substring.

Together with 1666614463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666614463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833307230 + 833307231.

It is an arithmetic number, because the mean of its divisors is an integer number (833307231).

Almost surely, 2^1666614461 is an apocalyptic number.

It is an amenable number.

1666614461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666614461 is an equidigital number, since it uses as much as digits as its factorization.

1666614461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 41.

The square root of 1666614461 is about 40824.1896551542. The cubic root of 1666614461 is about 1185.6187220350.

The spelling of 1666614461 in words is "one billion, six hundred sixty-six million, six hundred fourteen thousand, four hundred sixty-one".