128157542165 has 4 divisors (see below), whose sum is σ = 153789050604. Its totient is φ = 102526033728.

The previous prime is 128157542141. The next prime is 128157542203. The reversal of 128157542165 is 561245751821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90722644804 + 37434897361 = 301202^2 + 193481^2 .

It is a cyclic number.

It is not a de Polignac number, because 128157542165 - 2²⁶ = 128090433301 is a prime.

It is a super-2 number, since 2×128157542165² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12815754212 + ... + 12815754221.

It is an arithmetic number, because the mean of its divisors is an integer number (38447262651).

Almost surely, 2^128157542165 is an apocalyptic number.

It is an amenable number.

128157542165 is a deficient number, since it is larger than the sum of its proper divisors (25631508439).

128157542165 is an equidigital number, since it uses as much as digits as its factorization.

128157542165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25631508438.

The product of its digits is 672000, while the sum is 47.

The spelling of 128157542165 in words is "one hundred twenty-eight billion, one hundred fifty-seven million, five hundred forty-two thousand, one hundred sixty-five".