136005718778 has 4 divisors (see below), whose sum is σ = 204008578170. Its totient is φ = 68002859388.

The previous prime is 136005718757. The next prime is 136005718837. The reversal of 136005718778 is 877817500631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877817500631 = 719 ⋅1220886649.

It can be written as a sum of positive squares in only one way, i.e., 119600463889 + 16405254889 = 345833^2 + 128083^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34001429693 + ... + 34001429696.

Almost surely, 2^136005718778 is an apocalyptic number.

136005718778 is a deficient number, since it is larger than the sum of its proper divisors (68002859392).

136005718778 is an equidigital number, since it uses as much as digits as its factorization.

136005718778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68002859391.

The product of its (nonzero) digits is 1975680, while the sum is 53.

The spelling of 136005718778 in words is "one hundred thirty-six billion, five million, seven hundred eighteen thousand, seven hundred seventy-eight".