1646009005 has 8 divisors (see below), whose sum is σ = 1995574392. Its totient is φ = 1303231488.

The previous prime is 1646008979. The next prime is 1646009009. The reversal of 1646009005 is 5009006461.

It can be written as a sum of positive squares in 4 ways, for example, as 169989444 + 1476019561 = 13038^2 + 38419^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1646009005 - 2⁷ = 1646008877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646009009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1696432 + ... + 1697401.

It is an arithmetic number, because the mean of its divisors is an integer number (249446799).

Almost surely, 2^1646009005 is an apocalyptic number.

It is an amenable number.

1646009005 is a deficient number, since it is larger than the sum of its proper divisors (349565387).

1646009005 is an equidigital number, since it uses as much as digits as its factorization.

1646009005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3393935.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1646009005 is about 40571.0365285384. The cubic root of 1646009005 is about 1180.7122495449.

The spelling of 1646009005 in words is "one billion, six hundred forty-six million, nine thousand, five".