66863771 has 8 divisors (see below), whose sum is σ = 76243104. Its totient is φ = 58089600.

The previous prime is 66863711. The next prime is 66863779. The reversal of 66863771 is 17736866.

It is a happy number.

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 66863771 - 2⁶ = 66863707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66863779) 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, 151055 + ... + 151496.

It is an arithmetic number, because the mean of its divisors is an integer number (9530388).

Almost surely, 2^66863771 is an apocalyptic number.

66863771 is a deficient number, since it is larger than the sum of its proper divisors (9379333).

66863771 is a wasteful number, since it uses less digits than its factorization.

66863771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302581.

The product of its digits is 254016, while the sum is 44.

The square root of 66863771 is about 8177.0270269824. The cubic root of 66863771 is about 405.8793493166.

The spelling of 66863771 in words is "sixty-six million, eight hundred sixty-three thousand, seven hundred seventy-one".