66598749 has 24 divisors (see below), whose sum is σ = 110215872. Its totient is φ = 37961280.

The previous prime is 66598747. The next prime is 66598759. The reversal of 66598749 is 94789566.

66598749 is a `hidden beast` number, since 6 + 6 + 598 + 7 + 49 = 666.

It is not a de Polignac number, because 66598749 - 2¹ = 66598747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66598695 and 66598704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66598747) 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 23 ways as a sum of consecutive naturals, for example, 29857 + ... + 32009.

It is an arithmetic number, because the mean of its divisors is an integer number (4592328).

Almost surely, 2^66598749 is an apocalyptic number.

It is an amenable number.

66598749 is a deficient number, since it is larger than the sum of its proper divisors (43617123).

66598749 is a wasteful number, since it uses less digits than its factorization.

66598749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657 (or 2654 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 66598749 is about 8160.8056587570. The cubic root of 66598749 is about 405.3423899291.

The spelling of 66598749 in words is "sixty-six million, five hundred ninety-eight thousand, seven hundred forty-nine".