1646566452 has 36 divisors (see below), whose sum is σ = 4274648196. Its totient is φ = 534021120.

The previous prime is 1646566447. The next prime is 1646566459. The reversal of 1646566452 is 2546656461.

1646566452 is a `hidden beast` number, since 1 + 6 + 46 + 566 + 45 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1395470736 + 251095716 = 37356^2 + 15846^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1646566452² = 5422362161703736608, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1646566398 and 1646566407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646566459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 616749 + ... + 619412.

Almost surely, 2^1646566452 is an apocalyptic number.

1646566452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1646566452 is an abundant number, since it is smaller than the sum of its proper divisors (2628081744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1646566452 is a wasteful number, since it uses less digits than its factorization.

1646566452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236208 (or 1236203 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The square root of 1646566452 is about 40577.9059587850. The cubic root of 1646566452 is about 1180.8455234641.

Subtracting 1646566452 from its reverse (2546656461), we obtain a palindrome (900090009).

The spelling of 1646566452 in words is "one billion, six hundred forty-six million, five hundred sixty-six thousand, four hundred fifty-two".