136385643651784 has 32 divisors (see below), whose sum is σ = 256912816750200. Its totient is φ = 67875728555520.

The previous prime is 136385643651769. The next prime is 136385643651787. The reversal of 136385643651784 is 487156346583631.

It can be written as a sum of positive squares in 4 ways, for example, as 129506448408100 + 6879195243684 = 11380090^2 + 2622822^2 .

It is a super-2 number, since 2×136385643651784² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (136385643651787) 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, 4140637 + ... + 17026924.

Almost surely, 2^{136385643651784} is an apocalyptic number.

It is an amenable number.

136385643651784 is a deficient number, since it is larger than the sum of its proper divisors (120527173098416).

136385643651784 is a wasteful number, since it uses less digits than its factorization.

136385643651784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21171313 (or 21171309 counting only the distinct ones).

The product of its digits is 1045094400, while the sum is 70.

The spelling of 136385643651784 in words is "one hundred thirty-six trillion, three hundred eighty-five billion, six hundred forty-three million, six hundred fifty-one thousand, seven hundred eighty-four".