128238850261201 has 4 divisors (see below), whose sum is σ = 128648559048292. Its totient is φ = 127829141474112.

The previous prime is 128238850261177. The next prime is 128238850261307. The reversal of 128238850261201 is 102162058832821.

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 5636711678976 + 122602138582225 = 2374176^2 + 11072585^2 .

It is a cyclic number.

It is not a de Polignac number, because 128238850261201 - 2¹⁷ = 128238850130129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128238850264201) 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, 204854393076 + ... + 204854393701.

It is an arithmetic number, because the mean of its divisors is an integer number (32162139762073).

Almost surely, 2^{128238850261201} is an apocalyptic number.

It is an amenable number.

128238850261201 is a deficient number, since it is larger than the sum of its proper divisors (409708787091).

128238850261201 is an equidigital number, since it uses as much as digits as its factorization.

128238850261201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409708787090.

The product of its (nonzero) digits is 737280, while the sum is 49.

The spelling of 128238850261201 in words is "one hundred twenty-eight trillion, two hundred thirty-eight billion, eight hundred fifty million, two hundred sixty-one thousand, two hundred one".