66807478478 has 16 divisors (see below), whose sum is σ = 107927312976. Its totient is φ = 30832066560.

The previous prime is 66807478477. The next prime is 66807478589. The reversal of 66807478478 is 87487470866.

66807478478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66807478477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325838 + ... + 489678.

It is an arithmetic number, because the mean of its divisors is an integer number (6745457061).

Almost surely, 2^66807478478 is an apocalyptic number.

66807478478 is a deficient number, since it is larger than the sum of its proper divisors (41119834498).

66807478478 is a wasteful number, since it uses less digits than its factorization.

66807478478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179539.

The product of its (nonzero) digits is 101154816, while the sum is 65.

The spelling of 66807478478 in words is "sixty-six billion, eight hundred seven million, four hundred seventy-eight thousand, four hundred seventy-eight".