212151660068 has 6 divisors (see below), whose sum is σ = 371265405126. Its totient is φ = 106075830032.

The previous prime is 212151660067. The next prime is 212151660073. The reversal of 212151660068 is 860066151212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 117760158244 + 94391501824 = 343162^2 + 307232^2 .

It is not an unprimeable number, because it can be changed into a prime (212151660067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26518957505 + ... + 26518957512.

It is an arithmetic number, because the mean of its divisors is an integer number (61877567521).

Almost surely, 2^212151660068 is an apocalyptic number.

It is an amenable number.

212151660068 is a deficient number, since it is larger than the sum of its proper divisors (159113745058).

212151660068 is a wasteful number, since it uses less digits than its factorization.

212151660068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53037915021 (or 53037915019 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 212151660068 in words is "two hundred twelve billion, one hundred fifty-one million, six hundred sixty thousand, sixty-eight".