66555319 has 4 divisors (see below), whose sum is σ = 68850360. Its totient is φ = 64260280.

The previous prime is 66555311. The next prime is 66555371. The reversal of 66555319 is 91355566.

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

It is a cyclic number.

It is not a de Polignac number, because 66555319 - 2³ = 66555311 is a prime.

It is a super-2 number, since 2×66555319² = 8859220974383522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66555311) 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, 1147477 + ... + 1147534.

It is an arithmetic number, because the mean of its divisors is an integer number (17212590).

Almost surely, 2^66555319 is an apocalyptic number.

66555319 is a deficient number, since it is larger than the sum of its proper divisors (2295041).

66555319 is a wasteful number, since it uses less digits than its factorization.

66555319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295040.

The product of its digits is 121500, while the sum is 40.

The square root of 66555319 is about 8158.1443355704. The cubic root of 66555319 is about 405.2542609064.

The spelling of 66555319 in words is "sixty-six million, five hundred fifty-five thousand, three hundred nineteen".