66447434278 has 16 divisors (see below), whose sum is σ = 100234854720. Its totient is φ = 33036334056.

The previous prime is 66447434243. The next prime is 66447434281. The reversal of 66447434278 is 87243474466.

66447434278 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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128125 + ... + 386407.

It is an arithmetic number, because the mean of its divisors is an integer number (6264678420).

Almost surely, 2^66447434278 is an apocalyptic number.

66447434278 is a deficient number, since it is larger than the sum of its proper divisors (33787420442).

66447434278 is a wasteful number, since it uses less digits than its factorization.

66447434278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259011.

The product of its digits is 21676032, while the sum is 55.

The spelling of 66447434278 in words is "sixty-six billion, four hundred forty-seven million, four hundred thirty-four thousand, two hundred seventy-eight".