212076646717 has 4 divisors (see below), whose sum is σ = 228390234940. Its totient is φ = 195763058496.

The previous prime is 212076646711. The next prime is 212076646729. The reversal of 212076646717 is 717646670212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22578368121 + 189498278596 = 150261^2 + 435314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212076646717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212076646711) 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, 8156794092 + ... + 8156794117.

It is an arithmetic number, because the mean of its divisors is an integer number (57097558735).

Almost surely, 2^212076646717 is an apocalyptic number.

It is an amenable number.

212076646717 is a deficient number, since it is larger than the sum of its proper divisors (16313588223).

212076646717 is a wasteful number, since it uses less digits than its factorization.

212076646717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16313588222.

The product of its (nonzero) digits is 1185408, while the sum is 49.

The spelling of 212076646717 in words is "two hundred twelve billion, seventy-six million, six hundred forty-six thousand, seven hundred seventeen".