135861664969 has 4 divisors (see below), whose sum is σ = 137581432960. Its totient is φ = 134141896980.

The previous prime is 135861664963. The next prime is 135861664997. The reversal of 135861664969 is 969466168531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135861664969 - 2²⁷ = 135727447241 is a prime.

It is a super-2 number, since 2×135861664969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135861664969.

It is not an unprimeable number, because it can be changed into a prime (135861664963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 859883877 + ... + 859884034.

It is an arithmetic number, because the mean of its divisors is an integer number (34395358240).

Almost surely, 2^135861664969 is an apocalyptic number.

It is an amenable number.

135861664969 is a deficient number, since it is larger than the sum of its proper divisors (1719767991).

135861664969 is an equidigital number, since it uses as much as digits as its factorization.

135861664969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719767990.

The product of its digits is 50388480, while the sum is 64.

The spelling of 135861664969 in words is "one hundred thirty-five billion, eight hundred sixty-one million, six hundred sixty-four thousand, nine hundred sixty-nine".