9656128257 has 4 divisors (see below), whose sum is σ = 12874837680. Its totient is φ = 6437418836.

The previous prime is 9656128253. The next prime is 9656128291. The reversal of 9656128257 is 7528216569.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9656128257 - 2² = 9656128253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9656128253) 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, 1609354707 + ... + 1609354712.

It is an arithmetic number, because the mean of its divisors is an integer number (3218709420).

Almost surely, 2^9656128257 is an apocalyptic number.

It is an amenable number.

9656128257 is a deficient number, since it is larger than the sum of its proper divisors (3218709423).

9656128257 is a wasteful number, since it uses less digits than its factorization.

9656128257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3218709422.

The product of its digits is 1814400, while the sum is 51.

The square root of 9656128257 is about 98265.6005782288. The cubic root of 9656128257 is about 2129.4511180205.

The spelling of 9656128257 in words is "nine billion, six hundred fifty-six million, one hundred twenty-eight thousand, two hundred fifty-seven".