66291319 has 4 divisors (see below), whose sum is σ = 66314920. Its totient is φ = 66267720.

The previous prime is 66291311. The next prime is 66291331. The reversal of 66291319 is 91319266.

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 66291319 - 2³ = 66291311 is a prime.

It is a super-2 number, since 2×66291319² = 8789077949519522, 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 (66291311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6912 + ... + 13429.

It is an arithmetic number, because the mean of its divisors is an integer number (16578730).

Almost surely, 2^66291319 is an apocalyptic number.

66291319 is a deficient number, since it is larger than the sum of its proper divisors (23601).

66291319 is a wasteful number, since it uses less digits than its factorization.

66291319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23600.

The product of its digits is 17496, while the sum is 37.

The square root of 66291319 is about 8141.9481084075. The cubic root of 66291319 is about 404.7177202846.

The spelling of 66291319 in words is "sixty-six million, two hundred ninety-one thousand, three hundred nineteen".