1645556456 has 8 divisors (see below), whose sum is σ = 3085418370. Its totient is φ = 822778224.

The previous prime is 1645556453. The next prime is 1645556461. The reversal of 1645556456 is 6546555461.

It can be written as a sum of positive squares in only one way, i.e., 842740900 + 802815556 = 29030^2 + 28334^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1645556456.

It is not an unprimeable number, because it can be changed into a prime (1645556453) by changing a digit.

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 as a sum of consecutive naturals, namely, 102847271 + ... + 102847286.

Almost surely, 2^1645556456 is an apocalyptic number.

It is an amenable number.

1645556456 is a deficient number, since it is larger than the sum of its proper divisors (1439861914).

1645556456 is a wasteful number, since it uses less digits than its factorization.

1645556456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205694563 (or 205694559 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 47.

The square root of 1645556456 is about 40565.4589028646. The cubic root of 1645556456 is about 1180.6040324122.

The spelling of 1645556456 in words is "one billion, six hundred forty-five million, five hundred fifty-six thousand, four hundred fifty-six".