667215811242 has 12 divisors (see below), whose sum is σ = 1445634257730. Its totient is φ = 222405270408.

The previous prime is 667215811237. The next prime is 667215811267. The reversal of 667215811242 is 242118512766.

667215811242 is a `hidden beast` number, since 6 + 6 + 7 + 21 + 581 + 1 + 2 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 532329292881 + 134886518361 = 729609^2 + 367269^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18533772517 + ... + 18533772552.

Almost surely, 2^667215811242 is an apocalyptic number.

667215811242 is an abundant number, since it is smaller than the sum of its proper divisors (778418446488).

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

667215811242 is a wasteful number, since it uses less digits than its factorization.

667215811242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37067545077 (or 37067545074 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 667215811242 in words is "six hundred sixty-seven billion, two hundred fifteen million, eight hundred eleven thousand, two hundred forty-two".