66849352438 has 16 divisors (see below), whose sum is σ = 109428428736. Its totient is φ = 30375352840.

The previous prime is 66849352397. The next prime is 66849352439. The reversal of 66849352438 is 83425394866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66849352439) 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, 471856 + ... + 596947.

It is an arithmetic number, because the mean of its divisors is an integer number (6839276796).

Almost surely, 2^66849352438 is an apocalyptic number.

66849352438 is a deficient number, since it is larger than the sum of its proper divisors (42579076298).

66849352438 is a wasteful number, since it uses less digits than its factorization.

66849352438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071659.

The product of its digits is 29859840, while the sum is 58.

The spelling of 66849352438 in words is "sixty-six billion, eight hundred forty-nine million, three hundred fifty-two thousand, four hundred thirty-eight".