66670671 has 4 divisors (see below), whose sum is σ = 88894232. Its totient is φ = 44447112.

The previous prime is 66670657. The next prime is 66670673. The reversal of 66670671 is 17607666.

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

It is not a de Polignac number, because 66670671 - 2¹⁵ = 66637903 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 (66670673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11111776 + ... + 11111781.

It is an arithmetic number, because the mean of its divisors is an integer number (22223558).

Almost surely, 2^66670671 is an apocalyptic number.

66670671 is a deficient number, since it is larger than the sum of its proper divisors (22223561).

66670671 is a wasteful number, since it uses less digits than its factorization.

66670671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22223560.

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

The square root of 66670671 is about 8165.2110199308. The cubic root of 66670671 is about 405.4882512638.

The spelling of 66670671 in words is "sixty-six million, six hundred seventy thousand, six hundred seventy-one".