66655549 has 8 divisors (see below), whose sum is σ = 68906240. Its totient is φ = 64411200.

The previous prime is 66655513. The next prime is 66655573. The reversal of 66655549 is 94555666.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66655549 - 2²³ = 58266941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66655499 and 66655508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66655049) 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, 30214 + ... + 32344.

It is an arithmetic number, because the mean of its divisors is an integer number (8613280).

Almost surely, 2^66655549 is an apocalyptic number.

It is an amenable number.

66655549 is a deficient number, since it is larger than the sum of its proper divisors (2250691).

66655549 is a wasteful number, since it uses less digits than its factorization.

66655549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3171.

The product of its digits is 972000, while the sum is 46.

The square root of 66655549 is about 8164.2849656293. The cubic root of 66655549 is about 405.4575918204.

It can be divided in two parts, 66 and 655549, that multiplied together give a palindrome (43266234).

The spelling of 66655549 in words is "sixty-six million, six hundred fifty-five thousand, five hundred forty-nine".