1645450064 has 20 divisors (see below), whose sum is σ = 3204583956. Its totient is φ = 818460672.

The previous prime is 1645450039. The next prime is 1645450069. The reversal of 1645450064 is 4600545461.

It can be written as a sum of positive squares in 2 ways, for example, as 466214464 + 1179235600 = 21592^2 + 34340^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645450069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263339 + ... + 269514.

Almost surely, 2^1645450064 is an apocalyptic number.

It is an amenable number.

1645450064 is a deficient number, since it is larger than the sum of its proper divisors (1559133892).

1645450064 is a wasteful number, since it uses less digits than its factorization.

1645450064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533054 (or 533048 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 1645450064 is about 40564.1475197002. The cubic root of 1645450064 is about 1180.5785882267.

The spelling of 1645450064 in words is "one billion, six hundred forty-five million, four hundred fifty thousand, sixty-four".