66980281 has 8 divisors (see below), whose sum is σ = 68277600. Its totient is φ = 65688480.

The previous prime is 66980269. The next prime is 66980293. The reversal of 66980281 is 18208966.

It is an interprime number because it is at equal distance from previous prime (66980269) and next prime (66980293).

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 66980281 - 2²¹ = 64883129 is a prime.

It is a super-2 number, since 2×66980281² = 8972716085677922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66980261) 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, 29650 + ... + 31828.

It is an arithmetic number, because the mean of its divisors is an integer number (8534700).

Almost surely, 2^66980281 is an apocalyptic number.

It is an amenable number.

66980281 is a deficient number, since it is larger than the sum of its proper divisors (1297319).

66980281 is a wasteful number, since it uses less digits than its factorization.

66980281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2759.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 66980281 is about 8184.1481535955. The cubic root of 66980281 is about 406.1149605294.

The spelling of 66980281 in words is "sixty-six million, nine hundred eighty thousand, two hundred eighty-one".