1656328117 has 2 divisors, whose sum is σ = 1656328118. Its totient is φ = 1656328116.

The previous prime is 1656328111. The next prime is 1656328151. The reversal of 1656328117 is 7118236561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1007046756 + 649281361 = 31734^2 + 25481^2 .

It is an emirp because it is prime and its reverse (7118236561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1656328117 - 2¹⁵ = 1656295349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1656328117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1656328111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828164058 + 828164059.

It is an arithmetic number, because the mean of its divisors is an integer number (828164059).

Almost surely, 2^1656328117 is an apocalyptic number.

It is an amenable number.

1656328117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656328117 is an equidigital number, since it uses as much as digits as its factorization.

1656328117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 1656328117 is about 40698.0112167659. The cubic root of 1656328117 is about 1183.1744736732.

The spelling of 1656328117 in words is "one billion, six hundred fifty-six million, three hundred twenty-eight thousand, one hundred seventeen".