1645040616 has 16 divisors (see below), whose sum is σ = 4112601600. Its totient is φ = 548346864.

The previous prime is 1645040603. The next prime is 1645040623. The reversal of 1645040616 is 6160405461.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34271656 + ... + 34271703.

It is an arithmetic number, because the mean of its divisors is an integer number (257037600).

Almost surely, 2^1645040616 is an apocalyptic number.

It is an amenable number.

1645040616 is an abundant number, since it is smaller than the sum of its proper divisors (2467560984).

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

1645040616 is a wasteful number, since it uses less digits than its factorization.

1645040616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68543368 (or 68543364 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1645040616 is about 40559.1002858791. The cubic root of 1645040616 is about 1180.4806564303.

The spelling of 1645040616 in words is "one billion, six hundred forty-five million, forty thousand, six hundred sixteen".