66212549 has 16 divisors (see below), whose sum is σ = 76198080. Its totient is φ = 57024000.

The previous prime is 66212543. The next prime is 66212567. The reversal of 66212549 is 94521266.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66212549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66212543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14549 + ... + 18549.

It is an arithmetic number, because the mean of its divisors is an integer number (4762380).

Almost surely, 2^66212549 is an apocalyptic number.

It is an amenable number.

66212549 is a deficient number, since it is larger than the sum of its proper divisors (9985531).

66212549 is a wasteful number, since it uses less digits than its factorization.

66212549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4100.

The product of its digits is 25920, while the sum is 35.

The square root of 66212549 is about 8137.1093761851. The cubic root of 66212549 is about 404.5573561498.

The spelling of 66212549 in words is "sixty-six million, two hundred twelve thousand, five hundred forty-nine".