1646168329 has 9 divisors (see below), whose sum is σ = 1783108629. Its totient is φ = 1519053120.

The previous prime is 1646168273. The next prime is 1646168339. The reversal of 1646168329 is 9238616461.

The square root of 1646168329 is 40573.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1372332025 + 273836304 = 37045^2 + 16548^2 .

It is not a de Polignac number, because 1646168329 - 2⁷ = 1646168201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1646168339) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 525889 + ... + 529009.

It is an arithmetic number, because the mean of its divisors is an integer number (198123181).

Almost surely, 2^1646168329 is an apocalyptic number.

1646168329 is the 40573-rd square number.

1646168329 is the 20287-th centered octagonal number.

It is an amenable number.

1646168329 is a deficient number, since it is larger than the sum of its proper divisors (136940300).

1646168329 is an frugal number, since it uses more digits than its factorization.

1646168329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6268 (or 3134 counting only the distinct ones).

The product of its digits is 373248, while the sum is 46.

The cubic root of 1646168329 is about 1180.7503436518.

The spelling of 1646168329 in words is "one billion, six hundred forty-six million, one hundred sixty-eight thousand, three hundred twenty-nine".