12516403765 has 16 divisors (see below), whose sum is σ = 15972666480. Its totient is φ = 9382947840.

The previous prime is 12516403759. The next prime is 12516403813. The reversal of 12516403765 is 56730461521.

It can be written as a sum of positive squares in 8 ways, for example, as 808947364 + 11707456401 = 28442^2 + 108201^2 .

It is not a de Polignac number, because 12516403765 - 2⁷ = 12516403637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302046 + ... + 340975.

It is an arithmetic number, because the mean of its divisors is an integer number (998291655).

Almost surely, 2^12516403765 is an apocalyptic number.

It is an amenable number.

12516403765 is a deficient number, since it is larger than the sum of its proper divisors (3456262715).

12516403765 is a wasteful number, since it uses less digits than its factorization.

12516403765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643272.

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

The spelling of 12516403765 in words is "twelve billion, five hundred sixteen million, four hundred three thousand, seven hundred sixty-five".