135861663 has 24 divisors (see below), whose sum is σ = 211168128. Its totient is φ = 77471856.

The previous prime is 135861643. The next prime is 135861673. The reversal of 135861663 is 366168531.

It is not a de Polignac number, because 135861663 - 2⁶ = 135861599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135861643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120420 + ... + 121542.

It is an arithmetic number, because the mean of its divisors is an integer number (8798672).

Almost surely, 2^135861663 is an apocalyptic number.

135861663 is a deficient number, since it is larger than the sum of its proper divisors (75306465).

135861663 is a wasteful number, since it uses less digits than its factorization.

135861663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963 (or 1956 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 135861663 is about 11655.9711307124. The cubic root of 135861663 is about 514.0818945753.

The spelling of 135861663 in words is "one hundred thirty-five million, eight hundred sixty-one thousand, six hundred sixty-three".