66239894 has 16 divisors (see below), whose sum is σ = 114374400. Its totient is φ = 28183464.

The previous prime is 66239891. The next prime is 66239897. The reversal of 66239894 is 49893266.

It is an interprime number because it is at equal distance from previous prime (66239891) and next prime (66239897).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66239891) 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, 15074 + ... + 18965.

It is an arithmetic number, because the mean of its divisors is an integer number (7148400).

Almost surely, 2^66239894 is an apocalyptic number.

66239894 is a deficient number, since it is larger than the sum of its proper divisors (48134506).

66239894 is a wasteful number, since it uses less digits than its factorization.

66239894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34187.

The product of its digits is 559872, while the sum is 47.

The square root of 66239894 is about 8138.7894677280. The cubic root of 66239894 is about 404.6130409533.

Adding to 66239894 its product of digits (559872), we get a palindrome (66799766).

The spelling of 66239894 in words is "sixty-six million, two hundred thirty-nine thousand, eight hundred ninety-four".