66447434875 has 8 divisors (see below), whose sum is σ = 82926398880. Its totient is φ = 53157947800.

The previous prime is 66447434849. The next prime is 66447434899. The reversal of 66447434875 is 57843474466.

It is not a de Polignac number, because 66447434875 - 2⁵ = 66447434843 is a prime.

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, 265789615 + ... + 265789864.

It is an arithmetic number, because the mean of its divisors is an integer number (10365799860).

Almost surely, 2^66447434875 is an apocalyptic number.

66447434875 is a deficient number, since it is larger than the sum of its proper divisors (16478964005).

66447434875 is an equidigital number, since it uses as much as digits as its factorization.

66447434875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531579494 (or 531579484 counting only the distinct ones).

The product of its digits is 54190080, while the sum is 58.

The spelling of 66447434875 in words is "sixty-six billion, four hundred forty-seven million, four hundred thirty-four thousand, eight hundred seventy-five".