136653221878 has 4 divisors (see below), whose sum is σ = 204979832820. Its totient is φ = 68326610938.

The previous prime is 136653221849. The next prime is 136653221893. The reversal of 136653221878 is 878122356631.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34163305468 + ... + 34163305471.

It is an arithmetic number, because the mean of its divisors is an integer number (51244958205).

Almost surely, 2^136653221878 is an apocalyptic number.

136653221878 is a deficient number, since it is larger than the sum of its proper divisors (68326610942).

136653221878 is an equidigital number, since it uses as much as digits as its factorization.

136653221878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68326610941.

The product of its digits is 2903040, while the sum is 52.

The spelling of 136653221878 in words is "one hundred thirty-six billion, six hundred fifty-three million, two hundred twenty-one thousand, eight hundred seventy-eight".