13718661 has 8 divisors (see below), whose sum is σ = 19954464. Its totient is φ = 8314320.

The previous prime is 13718659. The next prime is 13718669. The reversal of 13718661 is 16681731.

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

It is not a de Polignac number, because 13718661 - 2¹ = 13718659 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 415717 = 13718661 / (1 + 3 + 7 + 1 + 8 + 6 + 6 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13718669) 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, 207826 + ... + 207891.

It is an arithmetic number, because the mean of its divisors is an integer number (2494308).

Almost surely, 2^13718661 is an apocalyptic number.

13718661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13718661 is a deficient number, since it is larger than the sum of its proper divisors (6235803).

13718661 is a wasteful number, since it uses less digits than its factorization.

13718661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415731.

The product of its digits is 6048, while the sum is 33.

The square root of 13718661 is about 3703.8710830697. The cubic root of 13718661 is about 239.3888443297.

The spelling of 13718661 in words is "thirteen million, seven hundred eighteen thousand, six hundred sixty-one".