12535515666 has 16 divisors (see below), whose sum is σ = 27856701600. Its totient is φ = 4178505204.

The previous prime is 12535515661. The next prime is 12535515691. The reversal of 12535515666 is 66651553521.

It is not an unprimeable number, because it can be changed into a prime (12535515661) 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, 116069536 + ... + 116069643.

It is an arithmetic number, because the mean of its divisors is an integer number (1741043850).

Almost surely, 2^12535515666 is an apocalyptic number.

12535515666 is an abundant number, since it is smaller than the sum of its proper divisors (15321185934).

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

12535515666 is a wasteful number, since it uses less digits than its factorization.

12535515666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232139190 (or 232139184 counting only the distinct ones).

The product of its digits is 810000, while the sum is 45.

The spelling of 12535515666 in words is "twelve billion, five hundred thirty-five million, five hundred fifteen thousand, six hundred sixty-six".