66212657 has 8 divisors (see below), whose sum is σ = 75872256. Its totient is φ = 56603232.

The previous prime is 66212651. The next prime is 66212681. The reversal of 66212657 is 75621266.

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

It is not a de Polignac number, because 66212657 - 2⁸ = 66212401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66212651) 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, 9668 + ... + 15029.

It is an arithmetic number, because the mean of its divisors is an integer number (9484032).

Almost surely, 2^66212657 is an apocalyptic number.

It is an amenable number.

66212657 is a deficient number, since it is larger than the sum of its proper divisors (9659599).

66212657 is a wasteful number, since it uses less digits than its factorization.

66212657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25087.

The product of its digits is 30240, while the sum is 35.

The square root of 66212657 is about 8137.1160124457. The cubic root of 66212657 is about 404.5575761090.

The spelling of 66212657 in words is "sixty-six million, two hundred twelve thousand, six hundred fifty-seven".