12998661 has 8 divisors (see below), whose sum is σ = 18664800. Its totient is φ = 7999152.

The previous prime is 12998653. The next prime is 12998663. The reversal of 12998661 is 16689921.

12998661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12998661 - 2³ = 12998653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12998663) 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, 166611 + ... + 166688.

It is an arithmetic number, because the mean of its divisors is an integer number (2333100).

Almost surely, 2^12998661 is an apocalyptic number.

It is an amenable number.

12998661 is a deficient number, since it is larger than the sum of its proper divisors (5666139).

12998661 is a wasteful number, since it uses less digits than its factorization.

12998661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333315.

The product of its digits is 46656, while the sum is 42.

The square root of 12998661 is about 3605.3655847916. The cubic root of 12998661 is about 235.1253955791.

It can be divided in two parts, 129 and 98661, that added together give a triangular number (98790 = T₄₄₄).

The spelling of 12998661 in words is "twelve million, nine hundred ninety-eight thousand, six hundred sixty-one".