66212026 has 4 divisors (see below), whose sum is σ = 99318042. Its totient is φ = 33106012.

The previous prime is 66212021. The next prime is 66212053. The reversal of 66212026 is 62021266.

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

It can be written as a sum of positive squares in only one way, i.e., 65853225 + 358801 = 8115^2 + 599^2 .

It is not an unprimeable number, because it can be changed into a prime (66212021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16553005 + ... + 16553008.

Almost surely, 2^66212026 is an apocalyptic number.

66212026 is a deficient number, since it is larger than the sum of its proper divisors (33106016).

66212026 is a wasteful number, since it uses less digits than its factorization.

66212026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33106015.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 66212026 is about 8137.0772394024. The cubic root of 66212026 is about 404.5562909738.

The spelling of 66212026 in words is "sixty-six million, two hundred twelve thousand, twenty-six".