1656885649 has 2 divisors, whose sum is σ = 1656885650. Its totient is φ = 1656885648.

The previous prime is 1656885611. The next prime is 1656885683. The reversal of 1656885649 is 9465886561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1521000000 + 135885649 = 39000^2 + 11657^2 .

It is an emirp because it is prime and its reverse (9465886561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1656885649 - 2⁹ = 1656885137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1656885593 and 1656885602.

It is not a weakly prime, because it can be changed into another prime (1656885949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828442824 + 828442825.

It is an arithmetic number, because the mean of its divisors is an integer number (828442825).

Almost surely, 2^1656885649 is an apocalyptic number.

It is an amenable number.

1656885649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656885649 is an equidigital number, since it uses as much as digits as its factorization.

1656885649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12441600, while the sum is 58.

The square root of 1656885649 is about 40704.8602626271. The cubic root of 1656885649 is about 1183.3072138033.

The spelling of 1656885649 in words is "one billion, six hundred fifty-six million, eight hundred eighty-five thousand, six hundred forty-nine".