1656612673 has 2 divisors, whose sum is σ = 1656612674. Its totient is φ = 1656612672.

The previous prime is 1656612653. The next prime is 1656612691. The reversal of 1656612673 is 3762166561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 967707664 + 688905009 = 31108^2 + 26247^2 .

It is an emirp because it is prime and its reverse (3762166561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1656612673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1656612613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828306336 + 828306337.

It is an arithmetic number, because the mean of its divisors is an integer number (828306337).

Almost surely, 2^1656612673 is an apocalyptic number.

It is an amenable number.

1656612673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656612673 is an equidigital number, since it uses as much as digits as its factorization.

1656612673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 43.

The square root of 1656612673 is about 40701.5070114118. The cubic root of 1656612673 is about 1183.2422259729.

The spelling of 1656612673 in words is "one billion, six hundred fifty-six million, six hundred twelve thousand, six hundred seventy-three".