135665697220 has 24 divisors (see below), whose sum is σ = 285926488344. Its totient is φ = 54070369536.

The previous prime is 135665697151. The next prime is 135665697221. The reversal of 135665697220 is 22796566531.

It can be written as a sum of positive squares in 4 ways, for example, as 4471061956 + 131194635264 = 66866^2 + 362208^2 .

It is not an unprimeable number, because it can be changed into a prime (135665697221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12238657 + ... + 12249736.

It is an arithmetic number, because the mean of its divisors is an integer number (11913603681).

Almost surely, 2^135665697220 is an apocalyptic number.

135665697220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135665697220 is an abundant number, since it is smaller than the sum of its proper divisors (150260791124).

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

135665697220 is a wasteful number, since it uses less digits than its factorization.

135665697220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24488679 (or 24488677 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 52.

The spelling of 135665697220 in words is "one hundred thirty-five billion, six hundred sixty-five million, six hundred ninety-seven thousand, two hundred twenty".