135566665531 has 4 divisors (see below), whose sum is σ = 147890907864. Its totient is φ = 123242423200.

The previous prime is 135566665519. The next prime is 135566665583.

135566665531 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135566665531 - 2¹¹ = 135566663483 is a prime.

It is a super-2 number, since 2×135566665531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135566665511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6162121150 + ... + 6162121171.

It is an arithmetic number, because the mean of its divisors is an integer number (36972726966).

Almost surely, 2^135566665531 is an apocalyptic number.

135566665531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

135566665531 is a deficient number, since it is larger than the sum of its proper divisors (12324242333).

135566665531 is a wasteful number, since it uses less digits than its factorization.

135566665531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12324242332.

The product of its digits is 7290000, while the sum is 52.

The spelling of 135566665531 in words is "one hundred thirty-five billion, five hundred sixty-six million, six hundred sixty-five thousand, five hundred thirty-one".