66320667 has 24 divisors (see below), whose sum is σ = 114296400. Its totient is φ = 37896768.

The previous prime is 66320647. The next prime is 66320671. The reversal of 66320667 is 76602366.

It is not a de Polignac number, because 66320667 - 2¹⁴ = 66304283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66320627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23742 + ... + 26387.

It is an arithmetic number, because the mean of its divisors is an integer number (4762350).

Almost surely, 2^66320667 is an apocalyptic number.

66320667 is a deficient number, since it is larger than the sum of its proper divisors (47975733).

66320667 is a wasteful number, since it uses less digits than its factorization.

66320667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50152 (or 50139 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 66320667 is about 8143.7501803530. The cubic root of 66320667 is about 404.7774360135. Note that the first 3 decimals are identical.

The spelling of 66320667 in words is "sixty-six million, three hundred twenty thousand, six hundred sixty-seven".