135665521890 has 16 divisors (see below), whose sum is σ = 325597252608. Its totient is φ = 36177472496.

The previous prime is 135665521853. The next prime is 135665521897. The reversal of 135665521890 is 98125566531.

It is not an unprimeable number, because it can be changed into a prime (135665521897) 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, 2261092002 + ... + 2261092061.

It is an arithmetic number, because the mean of its divisors is an integer number (20349828288).

Almost surely, 2^135665521890 is an apocalyptic number.

135665521890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

135665521890 is an abundant number, since it is smaller than the sum of its proper divisors (189931730718).

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

135665521890 is a wasteful number, since it uses less digits than its factorization.

135665521890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4522184073.

The product of its (nonzero) digits is 1944000, while the sum is 51.

The spelling of 135665521890 in words is "one hundred thirty-five billion, six hundred sixty-five million, five hundred twenty-one thousand, eight hundred ninety".