664420400452 has 6 divisors (see below), whose sum is σ = 1162735700798. Its totient is φ = 332210200224.

The previous prime is 664420400443. The next prime is 664420400453. The reversal of 664420400452 is 254004024466.

It can be written as a sum of positive squares in only one way, i.e., 455430620736 + 208989779716 = 674856^2 + 457154^2 .

It is not an unprimeable number, because it can be changed into a prime (664420400453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83052550053 + ... + 83052550060.

Almost surely, 2^664420400452 is an apocalyptic number.

It is an amenable number.

664420400452 is a deficient number, since it is larger than the sum of its proper divisors (498315300346).

664420400452 is a wasteful number, since it uses less digits than its factorization.

664420400452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166105100117 (or 166105100115 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 37.

The spelling of 664420400452 in words is "six hundred sixty-four billion, four hundred twenty million, four hundred thousand, four hundred fifty-two".