66798530 has 8 divisors (see below), whose sum is σ = 120237372. Its totient is φ = 26719408.

The previous prime is 66798527. The next prime is 66798533. The reversal of 66798530 is 3589766.

It is an interprime number because it is at equal distance from previous prime (66798527) and next prime (66798533).

It can be written as a sum of positive squares in 2 ways, for example, as 65496649 + 1301881 = 8093^2 + 1141^2 .

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

It is a super-2 number, since 2×66798530² = 8924087220321800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66798533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3339917 + ... + 3339936.

Almost surely, 2^66798530 is an apocalyptic number.

66798530 is a deficient number, since it is larger than the sum of its proper divisors (53438842).

66798530 is a wasteful number, since it uses less digits than its factorization.

66798530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6679860.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 66798530 is about 8173.0367673222. The cubic root of 66798530 is about 405.7472967798.

The spelling of 66798530 in words is "sixty-six million, seven hundred ninety-eight thousand, five hundred thirty".