128191937885 has 8 divisors (see below), whose sum is σ = 167814900576. Its totient is φ = 93230500240.

The previous prime is 128191937873. The next prime is 128191937897. The reversal of 128191937885 is 588739191821.

It is an interprime number because it is at equal distance from previous prime (128191937873) and next prime (128191937897).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128191937885 - 2¹⁶ = 128191872349 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 1165381199 + ... + 1165381308.

It is an arithmetic number, because the mean of its divisors is an integer number (20976862572).

Almost surely, 2^128191937885 is an apocalyptic number.

It is an amenable number.

128191937885 is a deficient number, since it is larger than the sum of its proper divisors (39622962691).

128191937885 is a wasteful number, since it uses less digits than its factorization.

128191937885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330762523.

The product of its digits is 8709120, while the sum is 62.

The spelling of 128191937885 in words is "one hundred twenty-eight billion, one hundred ninety-one million, nine hundred thirty-seven thousand, eight hundred eighty-five".