66612671 has 8 divisors (see below), whose sum is σ = 67953984. Its totient is φ = 65279520.

The previous prime is 66612653. The next prime is 66612701. The reversal of 66612671 is 17621666.

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 66612671 - 2⁶ = 66612607 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 (66612571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16010 + ... + 19736.

It is an arithmetic number, because the mean of its divisors is an integer number (8494248).

Almost surely, 2^66612671 is an apocalyptic number.

66612671 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

66612671 is a deficient number, since it is larger than the sum of its proper divisors (1341313).

66612671 is a wasteful number, since it uses less digits than its factorization.

66612671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4081.

The product of its digits is 18144, while the sum is 35.

The square root of 66612671 is about 8161.6585936928. The cubic root of 66612671 is about 405.3706326196.

The spelling of 66612671 in words is "sixty-six million, six hundred twelve thousand, six hundred seventy-one".