66118549 has 8 divisors (see below), whose sum is σ = 75613248. Its totient is φ = 56636160.

The previous prime is 66118543. The next prime is 66118597. The reversal of 66118549 is 94581166.

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

It is not a de Polignac number, because 66118549 - 2³ = 66118541 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 (66118541) 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, 19509 + ... + 22645.

It is an arithmetic number, because the mean of its divisors is an integer number (9451656).

Almost surely, 2^66118549 is an apocalyptic number.

It is an amenable number.

66118549 is a deficient number, since it is larger than the sum of its proper divisors (9494699).

66118549 is a wasteful number, since it uses less digits than its factorization.

66118549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6155.

The product of its digits is 51840, while the sum is 40.

The square root of 66118549 is about 8131.3313178101. The cubic root of 66118549 is about 404.3658194387.

The spelling of 66118549 in words is "sixty-six million, one hundred eighteen thousand, five hundred forty-nine".