128696764457 has 4 divisors (see below), whose sum is σ = 131434993536. Its totient is φ = 125958535380.

The previous prime is 128696764451. The next prime is 128696764463. The reversal of 128696764457 is 754467696821.

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 an interprime number because it is at equal distance from previous prime (128696764451) and next prime (128696764463).

It is a cyclic number.

It is not a de Polignac number, because 128696764457 - 2²⁰ = 128695715881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128696764393 and 128696764402.

It is not an unprimeable number, because it can be changed into a prime (128696764451) 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, 1369114469 + ... + 1369114562.

It is an arithmetic number, because the mean of its divisors is an integer number (32858748384).

Almost surely, 2^128696764457 is an apocalyptic number.

It is an amenable number.

128696764457 is a deficient number, since it is larger than the sum of its proper divisors (2738229079).

128696764457 is an equidigital number, since it uses as much as digits as its factorization.

128696764457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738229078.

The product of its digits is 121927680, while the sum is 65.

The spelling of 128696764457 in words is "one hundred twenty-eight billion, six hundred ninety-six million, seven hundred sixty-four thousand, four hundred fifty-seven".