136778421253508 has 24 divisors (see below), whose sum is σ = 239538104238048. Its totient is φ = 68338968474816.

The previous prime is 136778421253499. The next prime is 136778421253543. The reversal of 136778421253508 is 805352124877631.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98750360 + ... + 100125872.

It is an arithmetic number, because the mean of its divisors is an integer number (9980754343252).

Almost surely, 2^{136778421253508} is an apocalyptic number.

It is an amenable number.

136778421253508 is a deficient number, since it is larger than the sum of its proper divisors (102759682984540).

136778421253508 is a wasteful number, since it uses less digits than its factorization.

136778421253508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393763 (or 1393761 counting only the distinct ones).

The product of its (nonzero) digits is 67737600, while the sum is 62.

The spelling of 136778421253508 in words is "one hundred thirty-six trillion, seven hundred seventy-eight billion, four hundred twenty-one million, two hundred fifty-three thousand, five hundred eight".