66946377478 has 16 divisors (see below), whose sum is σ = 102189062160. Its totient is φ = 32884682400.

The previous prime is 66946377467. The next prime is 66946377479. The reversal of 66946377478 is 87477364966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66946377479) 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, 229828 + ... + 432103.

It is an arithmetic number, because the mean of its divisors is an integer number (6386816385).

Almost surely, 2^66946377478 is an apocalyptic number.

66946377478 is a deficient number, since it is larger than the sum of its proper divisors (35242684682).

66946377478 is a wasteful number, since it uses less digits than its factorization.

66946377478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662823.

The product of its digits is 256048128, while the sum is 67.

The spelling of 66946377478 in words is "sixty-six billion, nine hundred forty-six million, three hundred seventy-seven thousand, four hundred seventy-eight".