12123774457 has 4 divisors (see below), whose sum is σ = 12219237376. Its totient is φ = 12028311540.

The previous prime is 12123774431. The next prime is 12123774473. The reversal of 12123774457 is 75447732121.

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: 75447732121 = 73 ⋅1033530577.

It is a cyclic number.

It is not a de Polignac number, because 12123774457 - 2¹⁵ = 12123741689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12123774427) 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, 47731269 + ... + 47731522.

It is an arithmetic number, because the mean of its divisors is an integer number (3054809344).

Almost surely, 2^12123774457 is an apocalyptic number.

It is an amenable number.

12123774457 is a deficient number, since it is larger than the sum of its proper divisors (95462919).

12123774457 is an equidigital number, since it uses as much as digits as its factorization.

12123774457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95462918.

The product of its digits is 329280, while the sum is 43.

The spelling of 12123774457 in words is "twelve billion, one hundred twenty-three million, seven hundred seventy-four thousand, four hundred fifty-seven".