136400508499 has 4 divisors (see below), whose sum is σ = 136409049000. Its totient is φ = 136391968000.

The previous prime is 136400508481. The next prime is 136400508529. The reversal of 136400508499 is 994805004631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 136400508499 - 2⁵ = 136400508467 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136400506499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4246249 + ... + 4278250.

It is an arithmetic number, because the mean of its divisors is an integer number (34102262250).

Almost surely, 2^136400508499 is an apocalyptic number.

136400508499 is a deficient number, since it is larger than the sum of its proper divisors (8540501).

136400508499 is an equidigital number, since it uses as much as digits as its factorization.

136400508499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8540500.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 136400508499 in words is "one hundred thirty-six billion, four hundred million, five hundred eight thousand, four hundred ninety-nine".