66980081 has 4 divisors (see below), whose sum is σ = 76548672. Its totient is φ = 57411492.

The previous prime is 66980063. The next prime is 66980099. The reversal of 66980081 is 18008966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (66980063) and next prime (66980099).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66980081 is a prime.

It is a super-2 number, since 2×66980081² = 8972662501533122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66980021) 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, 4784285 + ... + 4784298.

It is an arithmetic number, because the mean of its divisors is an integer number (19137168).

Almost surely, 2^66980081 is an apocalyptic number.

It is an amenable number.

66980081 is a deficient number, since it is larger than the sum of its proper divisors (9568591).

66980081 is an equidigital number, since it uses as much as digits as its factorization.

66980081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9568590.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 66980081 is about 8184.1359348437. The cubic root of 66980081 is about 406.1145563156.

The spelling of 66980081 in words is "sixty-six million, nine hundred eighty thousand, eighty-one".