12345676565 has 16 divisors (see below), whose sum is σ = 15334170480. Its totient is φ = 9530680320.

The previous prime is 12345676537. The next prime is 12345676571. The reversal of 12345676565 is 56567654321.

It is a happy number.

12345676565 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 8 ways, for example, as 1461762289 + 10883914276 = 38233^2 + 104326^2 .

It is not a de Polignac number, because 12345676565 - 2¹⁰ = 12345675541 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249485 + ... + 294845.

It is an arithmetic number, because the mean of its divisors is an integer number (958385655).

Almost surely, 2^12345676565 is an apocalyptic number.

12345676565 is the 90722-nd pentagonal number.

It is an amenable number.

12345676565 is a deficient number, since it is larger than the sum of its proper divisors (2988493915).

12345676565 is a wasteful number, since it uses less digits than its factorization.

12345676565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47272.

The product of its digits is 4536000, while the sum is 50.

The spelling of 12345676565 in words is "twelve billion, three hundred forty-five million, six hundred seventy-six thousand, five hundred sixty-five".