1656564461 has 2 divisors, whose sum is σ = 1656564462. Its totient is φ = 1656564460.

The previous prime is 1656564359. The next prime is 1656564463. The reversal of 1656564461 is 1644656561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276704361 + 379860100 = 35731^2 + 19490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1656564461 is a prime.

Together with 1656564463, 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 (1656564463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828282230 + 828282231.

It is an arithmetic number, because the mean of its divisors is an integer number (828282231).

Almost surely, 2^1656564461 is an apocalyptic number.

It is an amenable number.

1656564461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656564461 is an equidigital number, since it uses as much as digits as its factorization.

1656564461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 44.

The square root of 1656564461 is about 40700.9147440202. The cubic root of 1656564461 is about 1183.2307473236.

The spelling of 1656564461 in words is "one billion, six hundred fifty-six million, five hundred sixty-four thousand, four hundred sixty-one".