128798189447042 has 8 divisors (see below), whose sum is σ = 193353466295676. Its totient is φ = 64347034015152.

The previous prime is 128798189446999. The next prime is 128798189447063. The reversal of 128798189447042 is 240744981897821.

It is a Cunningham number, because it is equal to 11348929²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 128798189447041 + 1 = 11348929^2 + 1^2 .

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

It is a super-2 number, since 2×128798189447042² (a number of 29 digits) contains 22 as substring.

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, 26030351093 + ... + 26030356040.

Almost surely, 2^{128798189447042} is an apocalyptic number.

128798189447042 is a deficient number, since it is larger than the sum of its proper divisors (64555276848634).

128798189447042 is a wasteful number, since it uses less digits than its factorization.

128798189447042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52060708372.

The product of its (nonzero) digits is 520224768, while the sum is 74.

The spelling of 128798189447042 in words is "one hundred twenty-eight trillion, seven hundred ninety-eight billion, one hundred eighty-nine million, four hundred forty-seven thousand, forty-two".