66670780478 has 16 divisors (see below), whose sum is σ = 107720534016. Its totient is φ = 30857443320.

The previous prime is 66670780469. The next prime is 66670780483. The reversal of 66670780478 is 87408707666.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 23375426 + ... + 23378277.

It is an arithmetic number, because the mean of its divisors is an integer number (6732533376).

Almost surely, 2^66670780478 is an apocalyptic number.

66670780478 is a deficient number, since it is larger than the sum of its proper divisors (41049753538).

66670780478 is a wasteful number, since it uses less digits than its factorization.

66670780478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46753759.

The product of its (nonzero) digits is 18966528, while the sum is 59.

The spelling of 66670780478 in words is "sixty-six billion, six hundred seventy million, seven hundred eighty thousand, four hundred seventy-eight".