665040061212 has 24 divisors (see below), whose sum is σ = 1552271179536. Its totient is φ = 221607015168.

The previous prime is 665040061171. The next prime is 665040061229. The reversal of 665040061212 is 212160040566.

665040061212 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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, 9087693 + ... + 9160580.

It is an arithmetic number, because the mean of its divisors is an integer number (64677965814).

Almost surely, 2^665040061212 is an apocalyptic number.

It is an amenable number.

665040061212 is an abundant number, since it is smaller than the sum of its proper divisors (887231118324).

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

665040061212 is a wasteful number, since it uses less digits than its factorization.

665040061212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18251317 (or 18251315 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 665040061212 in words is "six hundred sixty-five billion, forty million, sixty-one thousand, two hundred twelve".