12665550 has 24 divisors (see below), whose sum is σ = 31410936. Its totient is φ = 3377440.

The previous prime is 12665531. The next prime is 12665557. The reversal of 12665550 is 5556621.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42069 + ... + 42368.

It is an arithmetic number, because the mean of its divisors is an integer number (1308789).

Almost surely, 2^12665550 is an apocalyptic number.

12665550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12665550 is an abundant number, since it is smaller than the sum of its proper divisors (18745386).

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

12665550 is a wasteful number, since it uses less digits than its factorization.

12665550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84452 (or 84447 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 12665550 is about 3558.8692024293. The cubic root of 12665550 is about 233.0995049829.

The spelling of 12665550 in words is "twelve million, six hundred sixty-five thousand, five hundred fifty".