13663200561 has 24 divisors (see below), whose sum is σ = 19589739840. Its totient is φ = 8466535584.

The previous prime is 13663200553. The next prime is 13663200569. The reversal of 13663200561 is 16500236631.

It is an interprime number because it is at equal distance from previous prime (13663200553) and next prime (13663200569).

It is not a de Polignac number, because 13663200561 - 2³ = 13663200553 is a prime.

It is a super-2 number, since 2×13663200561² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13663200569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61621 + ... + 176418.

It is an arithmetic number, because the mean of its divisors is an integer number (816239160).

Almost surely, 2^13663200561 is an apocalyptic number.

It is an amenable number.

13663200561 is a deficient number, since it is larger than the sum of its proper divisors (5926539279).

13663200561 is a wasteful number, since it uses less digits than its factorization.

13663200561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238133 (or 238114 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The spelling of 13663200561 in words is "thirteen billion, six hundred sixty-three million, two hundred thousand, five hundred sixty-one".