212978499717 has 8 divisors (see below), whose sum is σ = 286782930720. Its totient is φ = 140579867600.

The previous prime is 212978499703. The next prime is 212978499749. The reversal of 212978499717 is 717994879212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212978499717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212978499817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351449367 + ... + 351449972.

It is an arithmetic number, because the mean of its divisors is an integer number (35847866340).

Almost surely, 2^212978499717 is an apocalyptic number.

It is an amenable number.

212978499717 is a deficient number, since it is larger than the sum of its proper divisors (73804431003).

212978499717 is a wasteful number, since it uses less digits than its factorization.

212978499717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702899443.

The product of its digits is 32006016, while the sum is 66.

The spelling of 212978499717 in words is "two hundred twelve billion, nine hundred seventy-eight million, four hundred ninety-nine thousand, seven hundred seventeen".