1645512056 has 8 divisors (see below), whose sum is σ = 3085335120. Its totient is φ = 822756024.

The previous prime is 1645512047. The next prime is 1645512061. The reversal of 1645512056 is 6502155461.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102844496 + ... + 102844511.

It is an arithmetic number, because the mean of its divisors is an integer number (385666890).

Almost surely, 2^1645512056 is an apocalyptic number.

It is an amenable number.

1645512056 is a deficient number, since it is larger than the sum of its proper divisors (1439823064).

1645512056 is a wasteful number, since it uses less digits than its factorization.

1645512056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205689013 (or 205689009 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 1645512056 is about 40564.9116355502. The cubic root of 1645512056 is about 1180.5934140607.

The spelling of 1645512056 in words is "one billion, six hundred forty-five million, five hundred twelve thousand, fifty-six".