135663212056 has 8 divisors (see below), whose sum is σ = 254368522620. Its totient is φ = 67831606024.

The previous prime is 135663212039. The next prime is 135663212093. The reversal of 135663212056 is 650212366531.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8478950746 + ... + 8478950761.

Almost surely, 2^135663212056 is an apocalyptic number.

It is an amenable number.

135663212056 is a deficient number, since it is larger than the sum of its proper divisors (118705310564).

135663212056 is a wasteful number, since it uses less digits than its factorization.

135663212056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16957901513 (or 16957901509 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

Adding to 135663212056 its reverse (650212366531), we get a palindrome (785875578587).

The spelling of 135663212056 in words is "one hundred thirty-five billion, six hundred sixty-three million, two hundred twelve thousand, fifty-six".