66490352678 has 16 divisors (see below), whose sum is σ = 103258746000. Its totient is φ = 32072638752.

The previous prime is 66490352671. The next prime is 66490352737. The reversal of 66490352678 is 87625309466.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66490352671) 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, 395108 + ... + 537671.

It is an arithmetic number, because the mean of its divisors is an integer number (6453671625).

Almost surely, 2^66490352678 is an apocalyptic number.

66490352678 is a deficient number, since it is larger than the sum of its proper divisors (36768393322).

66490352678 is a wasteful number, since it uses less digits than its factorization.

66490352678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934039.

The product of its (nonzero) digits is 13063680, while the sum is 56.

The spelling of 66490352678 in words is "sixty-six billion, four hundred ninety million, three hundred fifty-two thousand, six hundred seventy-eight".