66556011 has 4 divisors (see below), whose sum is σ = 88741352. Its totient is φ = 44370672.

The previous prime is 66555971. The next prime is 66556027. The reversal of 66556011 is 11065566.

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

It is not a de Polignac number, because 66556011 - 2⁶ = 66555947 is a prime.

It is a super-3 number, since 3×66556011³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66556011.

It is not an unprimeable number, because it can be changed into a prime (66556111) 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, 11092666 + ... + 11092671.

It is an arithmetic number, because the mean of its divisors is an integer number (22185338).

Almost surely, 2^66556011 is an apocalyptic number.

66556011 is a deficient number, since it is larger than the sum of its proper divisors (22185341).

66556011 is a wasteful number, since it uses less digits than its factorization.

66556011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22185340.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 66556011 is about 8158.1867470658. The cubic root of 66556011 is about 405.2556654271.

The spelling of 66556011 in words is "sixty-six million, five hundred fifty-six thousand, eleven".