66270557 has 8 divisors (see below), whose sum is σ = 67651200. Its totient is φ = 64904224.

The previous prime is 66270553. The next prime is 66270577. The reversal of 66270557 is 75507266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66270557 - 2² = 66270553 is a prime.

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 66270557.

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 7 ways as a sum of consecutive naturals, for example, 6044 + ... + 13002.

It is an arithmetic number, because the mean of its divisors is an integer number (8456400).

Almost surely, 2^66270557 is an apocalyptic number.

It is an amenable number.

66270557 is a deficient number, since it is larger than the sum of its proper divisors (1380643).

66270557 is a wasteful number, since it uses less digits than its factorization.

66270557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7155.

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 66270557 is about 8140.6730065763. The cubic root of 66270557 is about 404.6754642406.

The spelling of 66270557 in words is "sixty-six million, two hundred seventy thousand, five hundred fifty-seven".