66637963774 has 16 divisors (see below), whose sum is σ = 107025948000. Its totient is φ = 31006691584.

The previous prime is 66637963747. The next prime is 66637963781. The reversal of 66637963774 is 47736973666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11007874 + ... + 11013925.

It is an arithmetic number, because the mean of its divisors is an integer number (6689121750).

Almost surely, 2^66637963774 is an apocalyptic number.

66637963774 is a deficient number, since it is larger than the sum of its proper divisors (40387984226).

66637963774 is a wasteful number, since it uses less digits than its factorization.

66637963774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22021907.

The product of its digits is 144027072, while the sum is 64.

The spelling of 66637963774 in words is "sixty-six billion, six hundred thirty-seven million, nine hundred sixty-three thousand, seven hundred seventy-four".