1645621336 has 8 divisors (see below), whose sum is σ = 3085540020. Its totient is φ = 822810664.

The previous prime is 1645621297. The next prime is 1645621343. The reversal of 1645621336 is 6331265461.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1645621295 and 1645621304.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 102851326 + ... + 102851341.

Almost surely, 2^1645621336 is an apocalyptic number.

It is an amenable number.

1645621336 is a deficient number, since it is larger than the sum of its proper divisors (1439918684).

1645621336 is a wasteful number, since it uses less digits than its factorization.

1645621336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205702673 (or 205702669 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 1645621336 is about 40566.2585901140. The cubic root of 1645621336 is about 1180.6195482544.

Adding to 1645621336 its reverse (6331265461), we get a palindrome (7976886797).

The spelling of 1645621336 in words is "one billion, six hundred forty-five million, six hundred twenty-one thousand, three hundred thirty-six".