66530801 has 4 divisors (see below), whose sum is σ = 66597492. Its totient is φ = 66464112.

The previous prime is 66530759. The next prime is 66530831. The reversal of 66530801 is 10803566.

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 3312400 + 63218401 = 1820^2 + 7951^2 .

It is a cyclic number.

It is not a de Polignac number, because 66530801 - 2²² = 62336497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66530831) 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, 31826 + ... + 33851.

It is an arithmetic number, because the mean of its divisors is an integer number (16649373).

Almost surely, 2^66530801 is an apocalyptic number.

It is an amenable number.

66530801 is a deficient number, since it is larger than the sum of its proper divisors (66691).

66530801 is a wasteful number, since it uses less digits than its factorization.

66530801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66690.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66530801 is about 8156.6415270012. The cubic root of 66530801 is about 405.2044915593.

The spelling of 66530801 in words is "sixty-six million, five hundred thirty thousand, eight hundred one".