66270551 has 4 divisors (see below), whose sum is σ = 66482592. Its totient is φ = 66058512.

The previous prime is 66270541. The next prime is 66270553. The reversal of 66270551 is 15507266.

It is a happy number.

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 66270551 - 2⁶ = 66270487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66270553) 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, 105551 + ... + 106176.

It is an arithmetic number, because the mean of its divisors is an integer number (16620648).

Almost surely, 2^66270551 is an apocalyptic number.

66270551 is a deficient number, since it is larger than the sum of its proper divisors (212041).

66270551 is a wasteful number, since it uses less digits than its factorization.

66270551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212040.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 66270551 is about 8140.6726380564. The cubic root of 66270551 is about 404.6754520277.

The spelling of 66270551 in words is "sixty-six million, two hundred seventy thousand, five hundred fifty-one".