1645736633 has 8 divisors (see below), whose sum is σ = 1661184288. Its totient is φ = 1630304704.

The previous prime is 1645736593. The next prime is 1645736639. The reversal of 1645736633 is 3366375461.

It is a happy number.

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 1645736633 - 2²⁰ = 1644688057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645736639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359666 + ... + 364212.

It is an arithmetic number, because the mean of its divisors is an integer number (207648036).

Almost surely, 2^1645736633 is an apocalyptic number.

It is an amenable number.

1645736633 is a deficient number, since it is larger than the sum of its proper divisors (15447655).

1645736633 is a wasteful number, since it uses less digits than its factorization.

1645736633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7863.

The product of its digits is 816480, while the sum is 44.

The square root of 1645736633 is about 40567.6796600446. The cubic root of 1645736633 is about 1180.6471201529.

The spelling of 1645736633 in words is "one billion, six hundred forty-five million, seven hundred thirty-six thousand, six hundred thirty-three".