647380477771 has 12 divisors (see below), whose sum is σ = 653971828248. Its totient is φ = 640854905664.

The previous prime is 647380477717. The next prime is 647380477867. The reversal of 647380477771 is 177774083746.

It is not a de Polignac number, because 647380477771 - 2¹³ = 647380469579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647380477871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32697651 + ... + 32717443.

It is an arithmetic number, because the mean of its divisors is an integer number (54497652354).

Almost surely, 2^647380477771 is an apocalyptic number.

647380477771 is a deficient number, since it is larger than the sum of its proper divisors (6591350477).

647380477771 is a wasteful number, since it uses less digits than its factorization.

647380477771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23082 (or 22979 counting only the distinct ones).

The product of its (nonzero) digits is 38723328, while the sum is 61.

The spelling of 647380477771 in words is "six hundred forty-seven billion, three hundred eighty million, four hundred seventy-seven thousand, seven hundred seventy-one".