66888959 has 4 divisors (see below), whose sum is σ = 67127280. Its totient is φ = 66650640.

The previous prime is 66888937. The next prime is 66888961. The reversal of 66888959 is 95988866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95988866 = 2 ⋅47994433.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66888959 is a prime.

It is a super-2 number, since 2×66888959² = 8948265672207362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66888898 and 66888907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66888919) 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, 118739 + ... + 119300.

It is an arithmetic number, because the mean of its divisors is an integer number (16781820).

Almost surely, 2^66888959 is an apocalyptic number.

66888959 is a deficient number, since it is larger than the sum of its proper divisors (238321).

66888959 is a wasteful number, since it uses less digits than its factorization.

66888959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238320.

The product of its digits is 7464960, while the sum is 59.

The square root of 66888959 is about 8178.5670505291. The cubic root of 66888959 is about 405.9303086799.

The spelling of 66888959 in words is "sixty-six million, eight hundred eighty-eight thousand, nine hundred fifty-nine".