128356400023851 has 8 divisors (see below), whose sum is σ = 171161468367424. Its totient is φ = 85561132514760.

The previous prime is 128356400023829. The next prime is 128356400023909. The reversal of 128356400023851 is 158320004653821.

128356400023851 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 128356400023851 - 2²¹ = 128356397926699 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128356400023851.

It is not an unprimeable number, because it can be changed into a prime (128356400023811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2450178061 + ... + 2450230446.

It is an arithmetic number, because the mean of its divisors is an integer number (21395183545928).

Almost surely, 2^{128356400023851} is an apocalyptic number.

128356400023851 is a deficient number, since it is larger than the sum of its proper divisors (42805068343573).

128356400023851 is an equidigital number, since it uses as much as digits as its factorization.

128356400023851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4900417241.

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 128356400023851 in words is "one hundred twenty-eight trillion, three hundred fifty-six billion, four hundred million, twenty-three thousand, eight hundred fifty-one".