135556668 has 72 divisors (see below), whose sum is σ = 371488208. Its totient is φ = 41430528.

The previous prime is 135556661. The next prime is 135556699. The reversal of 135556668 is 866655531.

It is a super-2 number, since 2×135556668² = 36751220478524448, which contains 22 as substring.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135556661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75396 + ... + 77172.

Almost surely, 2^135556668 is an apocalyptic number.

135556668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135556668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185744104).

135556668 is an abundant number, since it is smaller than the sum of its proper divisors (235931540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135556668 is a wasteful number, since it uses less digits than its factorization.

135556668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1963 (or 1958 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 135556668 is about 11642.8805714050. The cubic root of 135556668 is about 513.6969199427.

The spelling of 135556668 in words is "one hundred thirty-five million, five hundred fifty-six thousand, six hundred sixty-eight".