1566610361 has 2 divisors, whose sum is σ = 1566610362. Its totient is φ = 1566610360.

The previous prime is 1566610351. The next prime is 1566610391. The reversal of 1566610361 is 1630166651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1123255225 + 443355136 = 33515^2 + 21056^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1566610361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1566610351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783305180 + 783305181.

It is an arithmetic number, because the mean of its divisors is an integer number (783305181).

Almost surely, 2^1566610361 is an apocalyptic number.

It is an amenable number.

1566610361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566610361 is an equidigital number, since it uses as much as digits as its factorization.

1566610361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1566610361 is about 39580.4290148553. The cubic root of 1566610361 is about 1161.4138430984.

The spelling of 1566610361 in words is "one billion, five hundred sixty-six million, six hundred ten thousand, three hundred sixty-one".