1656162889 has 2 divisors, whose sum is σ = 1656162890. Its totient is φ = 1656162888.

The previous prime is 1656162887. The next prime is 1656162913. The reversal of 1656162889 is 9882616561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1618855225 + 37307664 = 40235^2 + 6108^2 .

It is a cyclic number.

It is not a de Polignac number, because 1656162889 - 2¹ = 1656162887 is a prime.

Together with 1656162887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1656162887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828081444 + 828081445.

It is an arithmetic number, because the mean of its divisors is an integer number (828081445).

Almost surely, 2^1656162889 is an apocalyptic number.

It is an amenable number.

1656162889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656162889 is an equidigital number, since it uses as much as digits as its factorization.

1656162889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 52.

The square root of 1656162889 is about 40695.9812389381. The cubic root of 1656162889 is about 1183.1351296063.

The spelling of 1656162889 in words is "one billion, six hundred fifty-six million, one hundred sixty-two thousand, eight hundred eighty-nine".