12516621770407 has 2 divisors, whose sum is σ = 12516621770408. Its totient is φ = 12516621770406.

The previous prime is 12516621770347. The next prime is 12516621770483. The reversal of 12516621770407 is 70407712661521.

12516621770407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12516621770407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12516621773407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6258310885203 + 6258310885204.

It is an arithmetic number, because the mean of its divisors is an integer number (6258310885204).

Almost surely, 2^{12516621770407} is an apocalyptic number.

12516621770407 is a deficient number, since it is larger than the sum of its proper divisors (1).

12516621770407 is an equidigital number, since it uses as much as digits as its factorization.

12516621770407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 987840, while the sum is 49.

The spelling of 12516621770407 in words is "twelve trillion, five hundred sixteen billion, six hundred twenty-one million, seven hundred seventy thousand, four hundred seven".