1645155464 has 8 divisors (see below), whose sum is σ = 3084666510. Its totient is φ = 822577728.

The previous prime is 1645155443. The next prime is 1645155497. The reversal of 1645155464 is 4645515461.

It can be written as a sum of positive squares in only one way, i.e., 857904100 + 787251364 = 29290^2 + 28058^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102822209 + ... + 102822224.

Almost surely, 2^1645155464 is an apocalyptic number.

It is an amenable number.

1645155464 is a deficient number, since it is larger than the sum of its proper divisors (1439511046).

1645155464 is a wasteful number, since it uses less digits than its factorization.

1645155464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205644439 (or 205644435 counting only the distinct ones).

The product of its digits is 288000, while the sum is 41.

The square root of 1645155464 is about 40560.5160716675. The cubic root of 1645155464 is about 1180.5081274212.

The spelling of 1645155464 in words is "one billion, six hundred forty-five million, one hundred fifty-five thousand, four hundred sixty-four".