128745301778 has 4 divisors (see below), whose sum is σ = 193117952670. Its totient is φ = 64372650888.

The previous prime is 128745301759. The next prime is 128745301807. The reversal of 128745301778 is 877103547821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 123718917169 + 5026384609 = 351737^2 + 70897^2 .

It is a super-2 number, since 2×128745301778² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32186325443 + ... + 32186325446.

Almost surely, 2^128745301778 is an apocalyptic number.

128745301778 is a deficient number, since it is larger than the sum of its proper divisors (64372650892).

128745301778 is an equidigital number, since it uses as much as digits as its factorization.

128745301778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64372650891.

The product of its (nonzero) digits is 2634240, while the sum is 53.

The spelling of 128745301778 in words is "one hundred twenty-eight billion, seven hundred forty-five million, three hundred one thousand, seven hundred seventy-eight".