665146805272 has 32 divisors (see below), whose sum is σ = 1258607382480. Its totient is φ = 329531904000.

The previous prime is 665146805269. The next prime is 665146805287. The reversal of 665146805272 is 272508641566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470613 + ... + 1245700.

Almost surely, 2^665146805272 is an apocalyptic number.

It is an amenable number.

665146805272 is a deficient number, since it is larger than the sum of its proper divisors (593460577208).

665146805272 is a wasteful number, since it uses less digits than its factorization.

665146805272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716763 (or 1716759 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 52.

It can be divided in two parts, 66514 and 6805272, that added together give a palindrome (6871786).

The spelling of 665146805272 in words is "six hundred sixty-five billion, one hundred forty-six million, eight hundred five thousand, two hundred seventy-two".