66555011 has 8 divisors (see below), whose sum is σ = 67465440. Its totient is φ = 65651008.

The previous prime is 66554987. The next prime is 66555023. The reversal of 66555011 is 11055566.

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

It is a cyclic number.

It is not a de Polignac number, because 66555011 - 2¹⁸ = 66292867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66555311) 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, 21425 + ... + 24333.

It is an arithmetic number, because the mean of its divisors is an integer number (8433180).

Almost surely, 2^66555011 is an apocalyptic number.

66555011 is a deficient number, since it is larger than the sum of its proper divisors (910429).

66555011 is a wasteful number, since it uses less digits than its factorization.

66555011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3213.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 66555011 is about 8158.1254587068. The cubic root of 66555011 is about 405.2536357697.

The spelling of 66555011 in words is "sixty-six million, five hundred fifty-five thousand, eleven".