1566610489 has 2 divisors, whose sum is σ = 1566610490. Its totient is φ = 1566610488.

The previous prime is 1566610483. The next prime is 1566610501. The reversal of 1566610489 is 9840166651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1546062400 + 20548089 = 39320^2 + 4533^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566610489 - 2⁷ = 1566610361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1566610483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783305244 + 783305245.

It is an arithmetic number, because the mean of its divisors is an integer number (783305245).

Almost surely, 2^1566610489 is an apocalyptic number.

It is an amenable number.

1566610489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566610489 is an equidigital number, since it uses as much as digits as its factorization.

1566610489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 1566610489 is about 39580.4306318160. The cubic root of 1566610489 is about 1161.4138747296.

The spelling of 1566610489 in words is "one billion, five hundred sixty-six million, six hundred ten thousand, four hundred eighty-nine".