66514821 has 8 divisors (see below), whose sum is σ = 88728000. Its totient is φ = 44322432.

The previous prime is 66514817. The next prime is 66514831. The reversal of 66514821 is 12841566.

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

It is not a de Polignac number, because 66514821 - 2² = 66514817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66514831) 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, 5301 + ... + 12693.

It is an arithmetic number, because the mean of its divisors is an integer number (11091000).

Almost surely, 2^66514821 is an apocalyptic number.

It is an amenable number.

66514821 is a deficient number, since it is larger than the sum of its proper divisors (22213179).

66514821 is a wasteful number, since it uses less digits than its factorization.

66514821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10395.

The product of its digits is 11520, while the sum is 33.

The square root of 66514821 is about 8155.6618983379. The cubic root of 66514821 is about 405.1720470064.

The spelling of 66514821 in words is "sixty-six million, five hundred fourteen thousand, eight hundred twenty-one".