66578200624738 has 16 divisors (see below), whose sum is σ = 108963503106624. Its totient is φ = 30257997179760.

The previous prime is 66578200624709. The next prime is 66578200624739. The reversal of 66578200624738 is 83742600287566.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66578200624738.

It is not an unprimeable number, because it can be changed into a prime (66578200624739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240923070 + ... + 241199257.

It is an arithmetic number, because the mean of its divisors is an integer number (6810218944164).

Almost surely, 2^{66578200624738} is an apocalyptic number.

66578200624738 is a deficient number, since it is larger than the sum of its proper divisors (42385302481886).

66578200624738 is a wasteful number, since it uses less digits than its factorization.

66578200624738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482128617.

The product of its (nonzero) digits is 162570240, while the sum is 64.

The spelling of 66578200624738 in words is "sixty-six trillion, five hundred seventy-eight billion, two hundred million, six hundred twenty-four thousand, seven hundred thirty-eight".