12232557661 has 4 divisors (see below), whose sum is σ = 12294028000. Its totient is φ = 12171087324.

The previous prime is 12232557647. The next prime is 12232557691. The reversal of 12232557661 is 16675523221.

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: 16675523221 = 7 ⋅2382217603.

It is a cyclic number.

It is not a de Polignac number, because 12232557661 - 2¹⁷ = 12232426589 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 (12232557691) 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, 30734871 + ... + 30735268.

It is an arithmetic number, because the mean of its divisors is an integer number (3073507000).

Almost surely, 2^12232557661 is an apocalyptic number.

It is an amenable number.

12232557661 is a deficient number, since it is larger than the sum of its proper divisors (61470339).

12232557661 is an equidigital number, since it uses as much as digits as its factorization.

12232557661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61470338.

The product of its digits is 151200, while the sum is 40.

The spelling of 12232557661 in words is "twelve billion, two hundred thirty-two million, five hundred fifty-seven thousand, six hundred sixty-one".