128249202442 has 4 divisors (see below), whose sum is σ = 192373803666. Its totient is φ = 64124601220.

The previous prime is 128249202421. The next prime is 128249202479. The reversal of 128249202442 is 244202942821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244202942821 = 3313 ⋅73710517.

It can be written as a sum of positive squares in only one way, i.e., 118962218281 + 9286984161 = 344909^2 + 96369^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128249202395 and 128249202404.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32062300609 + ... + 32062300612.

Almost surely, 2^128249202442 is an apocalyptic number.

128249202442 is a deficient number, since it is larger than the sum of its proper divisors (64124601224).

128249202442 is an equidigital number, since it uses as much as digits as its factorization.

128249202442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64124601223.

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 128249202442 in words is "one hundred twenty-eight billion, two hundred forty-nine million, two hundred two thousand, four hundred forty-two".