66567001 has 4 divisors (see below), whose sum is σ = 66593332. Its totient is φ = 66540672.

The previous prime is 66566999. The next prime is 66567023. The reversal of 66567001 is 10076566.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39992976 + 26574025 = 6324^2 + 5155^2 .

It is a cyclic number.

It is not a de Polignac number, because 66567001 - 2¹ = 66566999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66567031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8916 + ... + 14581.

It is an arithmetic number, because the mean of its divisors is an integer number (16648333).

Almost surely, 2^66567001 is an apocalyptic number.

It is an amenable number.

66567001 is a deficient number, since it is larger than the sum of its proper divisors (26331).

66567001 is a wasteful number, since it uses less digits than its factorization.

66567001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26330.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 66567001 is about 8158.8602757983. The cubic root of 66567001 is about 405.2779700223.

The spelling of 66567001 in words is "sixty-six million, five hundred sixty-seven thousand, one".