66388298625 has 240 divisors, whose sum is σ = 137214325248. Its totient is φ = 32043924000.

The previous prime is 66388298597. The next prime is 66388298653. The reversal of 66388298625 is 52689288366.

It is an interprime number because it is at equal distance from previous prime (66388298597) and next prime (66388298653).

It is not a de Polignac number, because 66388298625 - 2⁷ = 66388298497 is a prime.

It is an unprimeable number.

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 239 ways as a sum of consecutive naturals, for example, 297705264 + ... + 297705486.

Almost surely, 2^66388298625 is an apocalyptic number.

It is an amenable number.

66388298625 is an abundant number, since it is smaller than the sum of its proper divisors (70826026623).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66388298625 is an frugal number, since it uses more digits than its factorization.

66388298625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 242 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 63.

It can be divided in two parts, 663 and 88298625, that added together give a palindrome (88299288).

The spelling of 66388298625 in words is "sixty-six billion, three hundred eighty-eight million, two hundred ninety-eight thousand, six hundred twenty-five".