66212113 has 4 divisors (see below), whose sum is σ = 72231408. Its totient is φ = 60192820.

The previous prime is 66212087. The next prime is 66212119. The reversal of 66212113 is 31121266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66212113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66212119) 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, 3009631 + ... + 3009652.

It is an arithmetic number, because the mean of its divisors is an integer number (18057852).

Almost surely, 2^66212113 is an apocalyptic number.

It is an amenable number.

66212113 is a deficient number, since it is larger than the sum of its proper divisors (6019295).

66212113 is a wasteful number, since it uses less digits than its factorization.

66212113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6019294.

The product of its digits is 432, while the sum is 22.

The square root of 66212113 is about 8137.0825853005. The cubic root of 66212113 is about 404.5564681641.

Adding to 66212113 its reverse (31121266), we get a palindrome (97333379).

The spelling of 66212113 in words is "sixty-six million, two hundred twelve thousand, one hundred thirteen".