135783670861 has 4 divisors (see below), whose sum is σ = 135800916732. Its totient is φ = 135766424992.

The previous prime is 135783670811. The next prime is 135783670873. The reversal of 135783670861 is 168076387531.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32209121961 + 103574548900 = 179469^2 + 321830^2 .

It is a cyclic number.

It is not a de Polignac number, because 135783670861 - 2²⁷ = 135649453133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135783670811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8611120 + ... + 8626873.

It is an arithmetic number, because the mean of its divisors is an integer number (33950229183).

Almost surely, 2^135783670861 is an apocalyptic number.

It is an amenable number.

135783670861 is a deficient number, since it is larger than the sum of its proper divisors (17245871).

135783670861 is an equidigital number, since it uses as much as digits as its factorization.

135783670861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17245870.

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 135783670861 in words is "one hundred thirty-five billion, seven hundred eighty-three million, six hundred seventy thousand, eight hundred sixty-one".