128312309657 has 16 divisors (see below), whose sum is σ = 159465133440. Its totient is φ = 100714814208.

The previous prime is 128312309651. The next prime is 128312309663. The reversal of 128312309657 is 756903213821.

It is an interprime number because it is at equal distance from previous prime (128312309651) and next prime (128312309663).

It is a cyclic number.

It is not a de Polignac number, because 128312309657 - 2¹⁰ = 128312308633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128312309651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14566607 + ... + 14575412.

It is an arithmetic number, because the mean of its divisors is an integer number (9966570840).

Almost surely, 2^128312309657 is an apocalyptic number.

128312309657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128312309657 is a deficient number, since it is larger than the sum of its proper divisors (31152823783).

128312309657 is a wasteful number, since it uses less digits than its factorization.

128312309657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29142080.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 128312309657 in words is "one hundred twenty-eight billion, three hundred twelve million, three hundred nine thousand, six hundred fifty-seven".