135566442 has 48 divisors (see below), whose sum is σ = 323650080. Its totient is φ = 40668000.

The previous prime is 135566429. The next prime is 135566467. The reversal of 135566442 is 244665531.

135566442 is a `hidden beast` number, since 1 + 3 + 5 + 5 + 6 + 644 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 135566397 and 135566406.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16609 + ... + 23387.

It is an arithmetic number, because the mean of its divisors is an integer number (6742710).

Almost surely, 2^135566442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135566442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161825040).

135566442 is an abundant number, since it is smaller than the sum of its proper divisors (188083638).

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

135566442 is a wasteful number, since it uses less digits than its factorization.

135566442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6899 (or 6896 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 135566442 is about 11643.3003053258. The cubic root of 135566442 is about 513.7092659554.

The spelling of 135566442 in words is "one hundred thirty-five million, five hundred sixty-six thousand, four hundred forty-two".