66632549 has 4 divisors (see below), whose sum is σ = 66714336. Its totient is φ = 66550764.

The previous prime is 66632543. The next prime is 66632567. The reversal of 66632549 is 94523666.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94523666 = 2 ⋅47261833.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66632549 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 (66632543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39659 + ... + 41304.

It is an arithmetic number, because the mean of its divisors is an integer number (16678584).

Almost surely, 2^66632549 is an apocalyptic number.

It is an amenable number.

66632549 is a deficient number, since it is larger than the sum of its proper divisors (81787).

66632549 is an equidigital number, since it uses as much as digits as its factorization.

66632549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81786.

The product of its digits is 233280, while the sum is 41.

The square root of 66632549 is about 8162.8762700411. The cubic root of 66632549 is about 405.4109510552.

The spelling of 66632549 in words is "sixty-six million, six hundred thirty-two thousand, five hundred forty-nine".