13661210625 has 80 divisors (see below), whose sum is σ = 24200003520. Its totient is φ = 6852768000.

The previous prime is 13661210621. The next prime is 13661210627. The reversal of 13661210625 is 52601216631.

It is not a de Polignac number, because 13661210625 - 2² = 13661210621 is a prime.

It is a super-2 number, since 2×13661210625² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13661210621) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 9211134 + ... + 9212616.

It is an arithmetic number, because the mean of its divisors is an integer number (302500044).

Almost surely, 2^13661210625 is an apocalyptic number.

13661210625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13661210625 is a deficient number, since it is larger than the sum of its proper divisors (10538792895).

13661210625 is an frugal number, since it uses more digits than its factorization.

13661210625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1508 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The spelling of 13661210625 in words is "thirteen billion, six hundred sixty-one million, two hundred ten thousand, six hundred twenty-five".