66706671 has 8 divisors (see below), whose sum is σ = 91346224. Its totient is φ = 43269120.

The previous prime is 66706667. The next prime is 66706687. The reversal of 66706671 is 17660766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66706671 - 2² = 66706667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66706621) 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, 300370 + ... + 300591.

It is an arithmetic number, because the mean of its divisors is an integer number (11418278).

Almost surely, 2^66706671 is an apocalyptic number.

66706671 is a deficient number, since it is larger than the sum of its proper divisors (24639553).

66706671 is a wasteful number, since it uses less digits than its factorization.

66706671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601001.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 66706671 is about 8167.4151969886. The cubic root of 66706671 is about 405.5612216329.

The spelling of 66706671 in words is "sixty-six million, seven hundred six thousand, six hundred seventy-one".