128420667865 has 8 divisors (see below), whose sum is σ = 176119773120. Its totient is φ = 88059886512.

The previous prime is 128420667833. The next prime is 128420667887. The reversal of 128420667865 is 568766024821.

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

It is a cyclic number.

It is not a de Polignac number, because 128420667865 - 2⁵ = 128420667833 is a prime.

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, 1834580935 + ... + 1834581004.

It is an arithmetic number, because the mean of its divisors is an integer number (22014971640).

Almost surely, 2^128420667865 is an apocalyptic number.

It is an amenable number.

128420667865 is a deficient number, since it is larger than the sum of its proper divisors (47699105255).

128420667865 is an equidigital number, since it uses as much as digits as its factorization.

128420667865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3669161951.

The product of its (nonzero) digits is 7741440, while the sum is 55.

The spelling of 128420667865 in words is "one hundred twenty-eight billion, four hundred twenty million, six hundred sixty-seven thousand, eight hundred sixty-five".