1645071656 has 16 divisors (see below), whose sum is σ = 3088269600. Its totient is φ = 821533104.

The previous prime is 1645071629. The next prime is 1645071671. The reversal of 1645071656 is 6561705461.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118346 + ... + 131513.

It is an arithmetic number, because the mean of its divisors is an integer number (193016850).

Almost surely, 2^1645071656 is an apocalyptic number.

It is an amenable number.

1645071656 is a deficient number, since it is larger than the sum of its proper divisors (1443197944).

1645071656 is a wasteful number, since it uses less digits than its factorization.

1645071656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250688 (or 250684 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 1645071656 is about 40559.4829355602. The cubic root of 1645071656 is about 1180.4880811485.

The spelling of 1645071656 in words is "one billion, six hundred forty-five million, seventy-one thousand, six hundred fifty-six".