12665801 has 8 divisors (see below), whose sum is σ = 13260480. Its totient is φ = 12074832.

The previous prime is 12665791. The next prime is 12665827. The reversal of 12665801 is 10856621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12665801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12661801) 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, 7991 + ... + 9443.

It is an arithmetic number, because the mean of its divisors is an integer number (1657560).

Almost surely, 2^12665801 is an apocalyptic number.

12665801 is the 2906-th pentagonal number.

It is an amenable number.

12665801 is a deficient number, since it is larger than the sum of its proper divisors (594679).

12665801 is a wasteful number, since it uses less digits than its factorization.

12665801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 12665801 is about 3558.9044662649. The cubic root of 12665801 is about 233.1010447920.

The spelling of 12665801 in words is "twelve million, six hundred sixty-five thousand, eight hundred one".