665871612710012 has 24 divisors (see below), whose sum is σ = 1221392110073856. Its totient is φ = 317032263245808.

The previous prime is 665871612709931. The next prime is 665871612710023. The reversal of 665871612710012 is 210017216178566.

665871612710012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×665871612710012² (a number of 30 digits) contains 22 as substring.

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, 16228084688 + ... + 16228125719.

It is an arithmetic number, because the mean of its divisors is an integer number (50891337919744).

Almost surely, 2^{665871612710012} is an apocalyptic number.

It is an amenable number.

665871612710012 is a deficient number, since it is larger than the sum of its proper divisors (555520497363844).

665871612710012 is a wasteful number, since it uses less digits than its factorization.

665871612710012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32456210657 (or 32456210655 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 53.

Adding to 665871612710012 its reverse (210017216178566), we get a palindrome (875888828888578).

The spelling of 665871612710012 in words is "six hundred sixty-five trillion, eight hundred seventy-one billion, six hundred twelve million, seven hundred ten thousand, twelve".