12161663653 has 4 divisors (see below), whose sum is σ = 12193417728. Its totient is φ = 12129909580.

The previous prime is 12161663629. The next prime is 12161663699. The reversal of 12161663653 is 35636616121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35636616121 = 7411 ⋅4808611.

It is a cyclic number.

It is not a de Polignac number, because 12161663653 - 2²¹ = 12159566501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12161663753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15876463 + ... + 15877228.

It is an arithmetic number, because the mean of its divisors is an integer number (3048354432).

Almost surely, 2^12161663653 is an apocalyptic number.

It is an amenable number.

12161663653 is a deficient number, since it is larger than the sum of its proper divisors (31754075).

12161663653 is an equidigital number, since it uses as much as digits as its factorization.

12161663653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31754074.

The product of its digits is 116640, while the sum is 40.

The spelling of 12161663653 in words is "twelve billion, one hundred sixty-one million, six hundred sixty-three thousand, six hundred fifty-three".