66678687603 has 12 divisors (see below), whose sum is σ = 105069447288. Its totient is φ = 40411325760.

The previous prime is 66678687599. The next prime is 66678687629. The reversal of 66678687603 is 30678687666.

It is not a de Polignac number, because 66678687603 - 2² = 66678687599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66678687403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 336760950 + ... + 336761147.

It is an arithmetic number, because the mean of its divisors is an integer number (8755787274).

Almost surely, 2^66678687603 is an apocalyptic number.

66678687603 is a deficient number, since it is larger than the sum of its proper divisors (38390759685).

66678687603 is a wasteful number, since it uses less digits than its factorization.

66678687603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673522114 (or 673522111 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 63.

Adding to 66678687603 its sum of digits (63), we get a palindrome (66678687666).

The spelling of 66678687603 in words is "sixty-six billion, six hundred seventy-eight million, six hundred eighty-seven thousand, six hundred three".