1646020225 has 12 divisors (see below), whose sum is σ = 2041588080. Its totient is φ = 1316478800.

The previous prime is 1646020219. The next prime is 1646020247. The reversal of 1646020225 is 5220206461.

It is not a de Polignac number, because 1646020225 - 2¹³ = 1646012033 is a prime.

It is a super-2 number, since 2×1646020225² = 5418765162218101250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1646020193 and 1646020202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147906 + ... + 158644.

It is an arithmetic number, because the mean of its divisors is an integer number (170132340).

Almost surely, 2^1646020225 is an apocalyptic number.

It is an amenable number.

1646020225 is a deficient number, since it is larger than the sum of its proper divisors (395567855).

1646020225 is a wasteful number, since it uses less digits than its factorization.

1646020225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16880 (or 16875 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1646020225 is about 40571.1748042868. The cubic root of 1646020225 is about 1180.7149323089.

Adding to 1646020225 its reverse (5220206461), we get a palindrome (6866226686).

The spelling of 1646020225 in words is "one billion, six hundred forty-six million, twenty thousand, two hundred twenty-five".