136881849349647 has 10 divisors (see below), whose sum is σ = 204477824337248. Its totient is φ = 91254566233044.

The previous prime is 136881849349627. The next prime is 136881849349723. The reversal of 136881849349647 is 746943948188631.

136881849349647 is a `hidden beast` number, since 1 + 3 + 6 + 8 + 8 + 1 + 84 + 9 + 3 + 496 + 47 = 666.

It is not a de Polignac number, because 136881849349647 - 2⁸ = 136881849349391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81), and also a Moran number because the ratio is a prime number: 1689899374687 = 136881849349647 / (1 + 3 + 6 + 8 + 8 + 1 + 8 + 4 + 9 + 3 + 4 + 9 + 6 + 4 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136881849349627) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 844949687263 + ... + 844949687424.

Almost surely, 2^{136881849349647} is an apocalyptic number.

136881849349647 is a deficient number, since it is larger than the sum of its proper divisors (67595974987601).

136881849349647 is an equidigital number, since it uses as much as digits as its factorization.

136881849349647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689899374699 (or 1689899374690 counting only the distinct ones).

The product of its digits is 6019743744, while the sum is 81.

The spelling of 136881849349647 in words is "one hundred thirty-six trillion, eight hundred eighty-one billion, eight hundred forty-nine million, three hundred forty-nine thousand, six hundred forty-seven".