665020001212 has 12 divisors (see below), whose sum is σ = 1330040002480. Its totient is φ = 285008571936.

The previous prime is 665020001207. The next prime is 665020001291. The reversal of 665020001212 is 212100020566.

665020001212 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11875357137 + ... + 11875357192.

Almost surely, 2^665020001212 is an apocalyptic number.

It is an amenable number.

665020001212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665020001212 is a wasteful number, since it uses less digits than its factorization.

665020001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23750714340 (or 23750714338 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 665020001212 its reverse (212100020566), we get a palindrome (877120021778).

The spelling of 665020001212 in words is "six hundred sixty-five billion, twenty million, one thousand, two hundred twelve".