66470777779 has 4 divisors (see below), whose sum is σ = 75966603184. Its totient is φ = 56974952376.

The previous prime is 66470777773. The next prime is 66470777909. The reversal of 66470777779 is 97777707466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97777707466 = 2 ⋅48888853733.

It is a cyclic number.

It is not a de Polignac number, because 66470777779 - 2⁹ = 66470777267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66470777773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4747912692 + ... + 4747912705.

It is an arithmetic number, because the mean of its divisors is an integer number (18991650796).

Almost surely, 2^66470777779 is an apocalyptic number.

66470777779 is a deficient number, since it is larger than the sum of its proper divisors (9495825405).

66470777779 is an equidigital number, since it uses as much as digits as its factorization.

66470777779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9495825404.

The product of its (nonzero) digits is 152473104, while the sum is 67.

The spelling of 66470777779 in words is "sixty-six billion, four hundred seventy million, seven hundred seventy-seven thousand, seven hundred seventy-nine".