66555201 has 8 divisors (see below), whose sum is σ = 89602240. Its totient is φ = 43939152.

The previous prime is 66555199. The next prime is 66555241. The reversal of 66555201 is 10255566.

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

It is not a de Polignac number, because 66555201 - 2¹ = 66555199 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66555241) 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, 107386 + ... + 108003.

It is an arithmetic number, because the mean of its divisors is an integer number (11200280).

Almost surely, 2^66555201 is an apocalyptic number.

It is an amenable number.

66555201 is a deficient number, since it is larger than the sum of its proper divisors (23047039).

66555201 is a wasteful number, since it uses less digits than its factorization.

66555201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215495.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 66555201 is about 8158.1371035304. The cubic root of 66555201 is about 405.2540214062.

The spelling of 66555201 in words is "sixty-six million, five hundred fifty-five thousand, two hundred one".