666774444777 has 8 divisors (see below), whose sum is σ = 1016037249216. Its totient is φ = 381013968432.

The previous prime is 666774444701. The next prime is 666774444799. The reversal of 666774444777 is 777444477666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666774444777 - 2¹⁵ = 666774412009 is a prime.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (666774444977) 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, 15875581998 + ... + 15875582039.

It is an arithmetic number, because the mean of its divisors is an integer number (127004656152).

Almost surely, 2^666774444777 is an apocalyptic number.

It is an amenable number.

666774444777 is a deficient number, since it is larger than the sum of its proper divisors (349262804439).

666774444777 is a wasteful number, since it uses less digits than its factorization.

666774444777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31751164047.

The product of its digits is 929359872, while the sum is 69.

The spelling of 666774444777 in words is "six hundred sixty-six billion, seven hundred seventy-four million, four hundred forty-four thousand, seven hundred seventy-seven".