665243254432 has 12 divisors (see below), whose sum is σ = 1309697657226. Its totient is φ = 332621627200.

The previous prime is 665243254409. The next prime is 665243254433. The reversal of 665243254432 is 234452342566.

It can be written as a sum of positive squares in only one way, i.e., 656741676816 + 8501577616 = 810396^2 + 92204^2 .

It is not an unprimeable number, because it can be changed into a prime (665243254433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10394425819 + ... + 10394425882.

Almost surely, 2^665243254432 is an apocalyptic number.

It is an amenable number.

665243254432 is a deficient number, since it is larger than the sum of its proper divisors (644454402794).

665243254432 is a wasteful number, since it uses less digits than its factorization.

665243254432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20788851711 (or 20788851703 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 46.

Adding to 665243254432 its reverse (234452342566), we get a palindrome (899695596998).

The spelling of 665243254432 in words is "six hundred sixty-five billion, two hundred forty-three million, two hundred fifty-four thousand, four hundred thirty-two".