13561668 has 60 divisors (see below), whose sum is σ = 37335760. Its totient is φ = 4280688.

The previous prime is 13561657. The next prime is 13561679. The reversal of 13561668 is 86616531.

It is a happy number.

13561668 is a `hidden beast` number, since 1 + 35 + 616 + 6 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (13561657) and next prime (13561679).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5055 + ... + 7257.

Almost surely, 2^13561668 is an apocalyptic number.

13561668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13561668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18667880).

13561668 is an abundant number, since it is smaller than the sum of its proper divisors (23774092).

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

13561668 is a wasteful number, since it uses less digits than its factorization.

13561668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238 (or 2227 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 13561668 is about 3682.6170042512. The cubic root of 13561668 is about 238.4721695306.

The spelling of 13561668 in words is "thirteen million, five hundred sixty-one thousand, six hundred sixty-eight".