135781663 has 4 divisors (see below), whose sum is σ = 135807760. Its totient is φ = 135755568.

The previous prime is 135781661. The next prime is 135781687. The reversal of 135781663 is 366187531.

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 135781663 - 2¹ = 135781661 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 (135781661) 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, 2283 + ... + 16636.

It is an arithmetic number, because the mean of its divisors is an integer number (33951940).

Almost surely, 2^135781663 is an apocalyptic number.

135781663 is a deficient number, since it is larger than the sum of its proper divisors (26097).

135781663 is an equidigital number, since it uses as much as digits as its factorization.

135781663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26096.

The product of its digits is 90720, while the sum is 40.

The square root of 135781663 is about 11652.5389078947. The cubic root of 135781663 is about 513.9809717554.

The spelling of 135781663 in words is "one hundred thirty-five million, seven hundred eighty-one thousand, six hundred sixty-three".