665245251628 has 6 divisors (see below), whose sum is σ = 1164179190356. Its totient is φ = 332622625812.

The previous prime is 665245251623. The next prime is 665245251647. The reversal of 665245251628 is 826152542566.

It is not an unprimeable number, because it can be changed into a prime (665245251623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83155656450 + ... + 83155656457.

Almost surely, 2^665245251628 is an apocalyptic number.

It is an amenable number.

665245251628 is a deficient number, since it is larger than the sum of its proper divisors (498933938728).

665245251628 is a wasteful number, since it uses less digits than its factorization.

665245251628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166311312911 (or 166311312909 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 52.

The spelling of 665245251628 in words is "six hundred sixty-five billion, two hundred forty-five million, two hundred fifty-one thousand, six hundred twenty-eight".