66616667 has 8 divisors (see below), whose sum is σ = 71818320. Its totient is φ = 61426080.

The previous prime is 66616663. The next prime is 66616691. The reversal of 66616667 is 76661666.

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 66616667 - 2² = 66616663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66616663) 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, 13184 + ... + 17522.

It is an arithmetic number, because the mean of its divisors is an integer number (8977290).

Almost surely, 2^66616667 is an apocalyptic number.

66616667 is a deficient number, since it is larger than the sum of its proper divisors (5201653).

66616667 is a wasteful number, since it uses less digits than its factorization.

66616667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5533.

The product of its digits is 326592, while the sum is 44.

The square root of 66616667 is about 8161.9033932043. The cubic root of 66616667 is about 405.3787383280.

The spelling of 66616667 in words is "sixty-six million, six hundred sixteen thousand, six hundred sixty-seven".