13858197561 has 108 divisors (see below), whose sum is σ = 23623470000. Its totient is φ = 7802982720.

The previous prime is 13858197553. The next prime is 13858197569. The reversal of 13858197561 is 16579185831.

It is a happy number.

13858197561 is a `hidden beast` number, since 1 + 3 + 8 + 581 + 9 + 7 + 56 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (13858197553) and next prime (13858197569).

It is not a de Polignac number, because 13858197561 - 2³ = 13858197553 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13858197498 and 13858197507.

It is not an unprimeable number, because it can be changed into a prime (13858197569) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 27771690 + ... + 27772188.

Almost surely, 2^13858197561 is an apocalyptic number.

It is an amenable number.

13858197561 is a deficient number, since it is larger than the sum of its proper divisors (9765272439).

13858197561 is a wasteful number, since it uses less digits than its factorization.

13858197561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 565 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 54.

The spelling of 13858197561 in words is "thirteen billion, eight hundred fifty-eight million, one hundred ninety-seven thousand, five hundred sixty-one".