13661625365 has 8 divisors (see below), whose sum is σ = 16406559288. Its totient is φ = 10920894400.

The previous prime is 13661625359. The next prime is 13661625431. The reversal of 13661625365 is 56352616631.

It can be written as a sum of positive squares in 4 ways, for example, as 28494244 + 13633131121 = 5338^2 + 116761^2 .

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

It is not a de Polignac number, because 13661625365 - 2⁴ = 13661625349 is a prime.

It is a super-2 number, since 2×13661625365² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1043582 + ... + 1056591.

It is an arithmetic number, because the mean of its divisors is an integer number (2050819911).

Almost surely, 2^13661625365 is an apocalyptic number.

It is an amenable number.

13661625365 is a deficient number, since it is larger than the sum of its proper divisors (2744933923).

13661625365 is a wasteful number, since it uses less digits than its factorization.

13661625365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101479.

The product of its digits is 583200, while the sum is 44.

The spelling of 13661625365 in words is "thirteen billion, six hundred sixty-one million, six hundred twenty-five thousand, three hundred sixty-five".