212686017646 has 8 divisors (see below), whose sum is σ = 325816878240. Its totient is φ = 104080391568.

The previous prime is 212686017641. The next prime is 212686017653. The reversal of 212686017646 is 646710686212.

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

It is a super-2 number, since 2×212686017646² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212686017646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212686017641) 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, 1131308511 + ... + 1131308698.

It is an arithmetic number, because the mean of its divisors is an integer number (40727109780).

Almost surely, 2^212686017646 is an apocalyptic number.

212686017646 is a deficient number, since it is larger than the sum of its proper divisors (113130860594).

212686017646 is a wasteful number, since it uses less digits than its factorization.

212686017646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2262617258.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 212686017646 in words is "two hundred twelve billion, six hundred eighty-six million, seventeen thousand, six hundred forty-six".