1656162905 has 4 divisors (see below), whose sum is σ = 1987395492. Its totient is φ = 1324930320.

The previous prime is 1656162889. The next prime is 1656162913. The reversal of 1656162905 is 5092616561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5092616561 = 127 ⋅40099343.

It can be written as a sum of positive squares in 2 ways, for example, as 1246019401 + 410143504 = 35299^2 + 20252^2 .

It is not a de Polignac number, because 1656162905 - 2⁴ = 1656162889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165616286 + ... + 165616295.

It is an arithmetic number, because the mean of its divisors is an integer number (496848873).

Almost surely, 2^1656162905 is an apocalyptic number.

It is an amenable number.

1656162905 is a deficient number, since it is larger than the sum of its proper divisors (331232587).

1656162905 is an equidigital number, since it uses as much as digits as its factorization.

1656162905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331232586.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 1656162905 is about 40695.9814355177. The cubic root of 1656162905 is about 1183.1351334163.

The spelling of 1656162905 in words is "one billion, six hundred fifty-six million, one hundred sixty-two thousand, nine hundred five".