66719081 has 8 divisors (see below), whose sum is σ = 78383424. Its totient is φ = 55987920.

The previous prime is 66719057. The next prime is 66719083. The reversal of 66719081 is 18091766.

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 66719081 - 2⁶ = 66719017 is a prime.

It is a super-2 number, since 2×66719081² = 8902871538969122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66719083) 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, 233141 + ... + 233426.

It is an arithmetic number, because the mean of its divisors is an integer number (9797928).

Almost surely, 2^66719081 is an apocalyptic number.

It is an amenable number.

66719081 is a deficient number, since it is larger than the sum of its proper divisors (11664343).

66719081 is a wasteful number, since it uses less digits than its factorization.

66719081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466591.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 66719081 is about 8168.1748879416. The cubic root of 66719081 is about 405.5863700556.

The spelling of 66719081 in words is "sixty-six million, seven hundred nineteen thousand, eighty-one".