12345661751 has 4 divisors (see below), whose sum is σ = 12364568472. Its totient is φ = 12326755032.

The previous prime is 12345661747. The next prime is 12345661753. The reversal of 12345661751 is 15716654321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12345661751 - 2² = 12345661747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12345661699 and 12345661708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12345661753) 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, 9452381 + ... + 9453686.

It is an arithmetic number, because the mean of its divisors is an integer number (3091142118).

Almost surely, 2^12345661751 is an apocalyptic number.

12345661751 is a deficient number, since it is larger than the sum of its proper divisors (18906721).

12345661751 is an equidigital number, since it uses as much as digits as its factorization.

12345661751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18906720.

The product of its digits is 151200, while the sum is 41.

The spelling of 12345661751 in words is "twelve billion, three hundred forty-five million, six hundred sixty-one thousand, seven hundred fifty-one".