136681581456 has 60 divisors (see below), whose sum is σ = 437164108992. Its totient is φ = 39051880128.

The previous prime is 136681581433. The next prime is 136681581461. The reversal of 136681581456 is 654185186631.

136681581456 is a `hidden beast` number, since 1 + 3 + 6 + 6 + 8 + 1 + 581 + 4 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67797396 + ... + 67799411.

Almost surely, 2^136681581456 is an apocalyptic number.

136681581456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

136681581456 is an abundant number, since it is smaller than the sum of its proper divisors (300482527536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

136681581456 is a wasteful number, since it uses less digits than its factorization.

136681581456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135596828 (or 135596819 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The spelling of 136681581456 in words is "one hundred thirty-six billion, six hundred eighty-one million, five hundred eighty-one thousand, four hundred fifty-six".