66960081 has 8 divisors (see below), whose sum is σ = 99200160. Its totient is φ = 44640036.

The previous prime is 66960079. The next prime is 66960083. The reversal of 66960081 is 18006966.

It is an interprime number because it is at equal distance from previous prime (66960079) and next prime (66960083).

It is not a de Polignac number, because 66960081 - 2¹ = 66960079 is a prime.

It is a super-2 number, since 2×66960081² = 8967304895053122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66960083) 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, 1239975 + ... + 1240028.

It is an arithmetic number, because the mean of its divisors is an integer number (12400020).

Almost surely, 2^66960081 is an apocalyptic number.

It is an amenable number.

66960081 is a deficient number, since it is larger than the sum of its proper divisors (32240079).

66960081 is a wasteful number, since it uses less digits than its factorization.

66960081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2480012 (or 2480006 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 66960081 is about 8182.9139675301. The cubic root of 66960081 is about 406.0741308659.

The spelling of 66960081 in words is "sixty-six million, nine hundred sixty thousand, eighty-one".