66205427 has 4 divisors (see below), whose sum is σ = 67454640. Its totient is φ = 64956216.

The previous prime is 66205421. The next prime is 66205439. The reversal of 66205427 is 72450266.

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 66205427 - 2⁴ = 66205411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66205393 and 66205402.

It is not an unprimeable number, because it can be changed into a prime (66205421) 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, 624527 + ... + 624632.

It is an arithmetic number, because the mean of its divisors is an integer number (16863660).

Almost surely, 2^66205427 is an apocalyptic number.

66205427 is a deficient number, since it is larger than the sum of its proper divisors (1249213).

66205427 is a wasteful number, since it uses less digits than its factorization.

66205427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249212.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 66205427 is about 8136.6717397226. The cubic root of 66205427 is about 404.5428505370.

The spelling of 66205427 in words is "sixty-six million, two hundred five thousand, four hundred twenty-seven".