66800667 has 8 divisors (see below), whose sum is σ = 94306896. Its totient is φ = 41914112.

The previous prime is 66800647. The next prime is 66800681. The reversal of 66800667 is 76600866.

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

It is not a de Polignac number, because 66800667 - 2¹¹ = 66798619 is a prime.

It is a super-2 number, since 2×66800667² = 8924658223289778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66800647) 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, 654858 + ... + 654959.

It is an arithmetic number, because the mean of its divisors is an integer number (11788362).

Almost surely, 2^66800667 is an apocalyptic number.

66800667 is a deficient number, since it is larger than the sum of its proper divisors (27506229).

66800667 is a wasteful number, since it uses less digits than its factorization.

66800667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309837.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 66800667 is about 8173.1675010365. The cubic root of 66800667 is about 405.7516235852.

The spelling of 66800667 in words is "sixty-six million, eight hundred thousand, six hundred sixty-seven".