136681520445 has 32 divisors (see below), whose sum is σ = 243011059200. Its totient is φ = 72890304192.

The previous prime is 136681520441. The next prime is 136681520477. The reversal of 136681520445 is 544025186631.

136681520445 is a `hidden beast` number, since 1 + 3 + 6 + 6 + 81 + 520 + 4 + 45 = 666.

It is not a de Polignac number, because 136681520445 - 2² = 136681520441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 136681520445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136681520441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1730271 + ... + 1807539.

It is an arithmetic number, because the mean of its divisors is an integer number (7594095600).

Almost surely, 2^136681520445 is an apocalyptic number.

136681520445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

136681520445 is a deficient number, since it is larger than the sum of its proper divisors (106329538755).

136681520445 is a wasteful number, since it uses less digits than its factorization.

136681520445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90386 (or 90380 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 136681520445 in words is "one hundred thirty-six billion, six hundred eighty-one million, five hundred twenty thousand, four hundred forty-five".