66981467 has 4 divisors (see below), whose sum is σ = 76550256. Its totient is φ = 57412680.

The previous prime is 66981463. The next prime is 66981469. The reversal of 66981467 is 76418966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66981467 - 2² = 66981463 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66981463) 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 3 ways as a sum of consecutive naturals, for example, 4784384 + ... + 4784397.

It is an arithmetic number, because the mean of its divisors is an integer number (19137564).

Almost surely, 2^66981467 is an apocalyptic number.

66981467 is a deficient number, since it is larger than the sum of its proper divisors (9568789).

66981467 is an equidigital number, since it uses as much as digits as its factorization.

66981467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9568788.

The product of its digits is 435456, while the sum is 47.

The square root of 66981467 is about 8184.2206104186. The cubic root of 66981467 is about 406.1173575011.

The spelling of 66981467 in words is "sixty-six million, nine hundred eighty-one thousand, four hundred sixty-seven".