66612667 has 4 divisors (see below), whose sum is σ = 72668376. Its totient is φ = 60556960.

The previous prime is 66612653. The next prime is 66612701. The reversal of 66612667 is 76621666.

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

It is a cyclic number.

It is not a de Polignac number, because 66612667 - 2¹⁵ = 66579899 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66612607) 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, 3027838 + ... + 3027859.

It is an arithmetic number, because the mean of its divisors is an integer number (18167094).

Almost surely, 2^66612667 is an apocalyptic number.

66612667 is a deficient number, since it is larger than the sum of its proper divisors (6055709).

66612667 is a wasteful number, since it uses less digits than its factorization.

66612667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6055708.

The product of its digits is 108864, while the sum is 40.

The square root of 66612667 is about 8161.6583486446. The cubic root of 66612667 is about 405.3706245057.

The spelling of 66612667 in words is "sixty-six million, six hundred twelve thousand, six hundred sixty-seven".