136778421254386 has 16 divisors (see below), whose sum is σ = 212667713280000. Its totient is φ = 65898635393808.

The previous prime is 136778421254383. The next prime is 136778421254399. The reversal of 136778421254386 is 683452124877631.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (136778421254381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2362945650 + ... + 2363003533.

It is an arithmetic number, because the mean of its divisors is an integer number (13291732080000).

Almost surely, 2^{136778421254386} is an apocalyptic number.

136778421254386 is a deficient number, since it is larger than the sum of its proper divisors (75889292025614).

136778421254386 is a wasteful number, since it uses less digits than its factorization.

136778421254386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4725949713.

The product of its digits is 325140480, while the sum is 67.

The spelling of 136778421254386 in words is "one hundred thirty-six trillion, seven hundred seventy-eight billion, four hundred twenty-one million, two hundred fifty-four thousand, three hundred eighty-six".