135908581551668 has 36 divisors (see below), whose sum is σ = 249835358596320. Its totient is φ = 64569293434800.

The previous prime is 135908581551667. The next prime is 135908581551703. The reversal of 135908581551668 is 866155185809531.

It is a super-2 number, since 2×135908581551668² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135908581551667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30297098 + ... + 34492481.

It is an arithmetic number, because the mean of its divisors is an integer number (6939871072120).

Almost surely, 2^{135908581551668} is an apocalyptic number.

It is an amenable number.

135908581551668 is a deficient number, since it is larger than the sum of its proper divisors (113926777044652).

135908581551668 is a wasteful number, since it uses less digits than its factorization.

135908581551668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64789908 (or 64789755 counting only the distinct ones).

The product of its (nonzero) digits is 311040000, while the sum is 71.

The spelling of 135908581551668 in words is "one hundred thirty-five trillion, nine hundred eight billion, five hundred eighty-one million, five hundred fifty-one thousand, six hundred sixty-eight".