66521017 has 8 divisors (see below), whose sum is σ = 71486496. Its totient is φ = 61672512.

The previous prime is 66521011. The next prime is 66521023. The reversal of 66521017 is 71012566.

It is an interprime number because it is at equal distance from previous prime (66521011) and next prime (66521023).

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 66521017 - 2⁷ = 66520889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66521011) 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 7 ways as a sum of consecutive naturals, for example, 28063 + ... + 30340.

It is an arithmetic number, because the mean of its divisors is an integer number (8935812).

Almost surely, 2^66521017 is an apocalyptic number.

66521017 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

66521017 is a deficient number, since it is larger than the sum of its proper divisors (4965479).

66521017 is a wasteful number, since it uses less digits than its factorization.

66521017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58487.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 66521017 is about 8156.0417482992. The cubic root of 66521017 is about 405.1846275011.

The spelling of 66521017 in words is "sixty-six million, five hundred twenty-one thousand, seventeen".