128247147777 has 96 divisors (see below), whose sum is σ = 213923758080. Its totient is φ = 66865979520.

The previous prime is 128247147767. The next prime is 128247147779. The reversal of 128247147777 is 777741742821.

It is not a de Polignac number, because 128247147777 - 2⁶ = 128247147713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (128247147779) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 53816328 + ... + 53818710.

It is an arithmetic number, because the mean of its divisors is an integer number (2228372480).

Almost surely, 2^128247147777 is an apocalyptic number.

It is an amenable number.

128247147777 is a deficient number, since it is larger than the sum of its proper divisors (85676610303).

128247147777 is a wasteful number, since it uses less digits than its factorization.

128247147777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691 (or 2672 counting only the distinct ones).

The product of its digits is 8605184, while the sum is 57.

The spelling of 128247147777 in words is "one hundred twenty-eight billion, two hundred forty-seven million, one hundred forty-seven thousand, seven hundred seventy-seven".