128502862756657 has 4 divisors (see below), whose sum is σ = 128502885450816. Its totient is φ = 128502840062500.

The previous prime is 128502862756627. The next prime is 128502862756727. The reversal of 128502862756657 is 756657268205821.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128502862756657 is a prime.

It is a super-3 number, since 3×128502862756657³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128502862756607) 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, 4918548 + ... + 16768954.

It is an arithmetic number, because the mean of its divisors is an integer number (32125721362704).

Almost surely, 2^{128502862756657} is an apocalyptic number.

It is an amenable number.

128502862756657 is a deficient number, since it is larger than the sum of its proper divisors (22694159).

128502862756657 is a wasteful number, since it uses less digits than its factorization.

128502862756657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22694158.

The product of its (nonzero) digits is 677376000, while the sum is 70.

The spelling of 128502862756657 in words is "one hundred twenty-eight trillion, five hundred two billion, eight hundred sixty-two million, seven hundred fifty-six thousand, six hundred fifty-seven".