667643665144246 has 8 divisors (see below), whose sum is σ = 1144531997390160. Its totient is φ = 286132999347528.

The previous prime is 667643665144241. The next prime is 667643665144277. The reversal of 667643665144246 is 642441566346766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667643665144241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23844416612281 + ... + 23844416612308.

It is an arithmetic number, because the mean of its divisors is an integer number (143066499673770).

Almost surely, 2^{667643665144246} is an apocalyptic number.

667643665144246 is a deficient number, since it is larger than the sum of its proper divisors (476888332245914).

667643665144246 is a wasteful number, since it uses less digits than its factorization.

667643665144246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47688833224598.

The product of its digits is 2508226560, while the sum is 70.

The spelling of 667643665144246 in words is "six hundred sixty-seven trillion, six hundred forty-three billion, six hundred sixty-five million, one hundred forty-four thousand, two hundred forty-six".