1217936385647 has 2 divisors, whose sum is σ = 1217936385648. Its totient is φ = 1217936385646.

The previous prime is 1217936385557. The next prime is 1217936385689. The reversal of 1217936385647 is 7465836397121.

It is a strong prime.

It is an emirp because it is prime and its reverse (7465836397121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1217936385647 - 2²⁰ = 1217935337071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1217936385647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217936385047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608968192823 + 608968192824.

It is an arithmetic number, because the mean of its divisors is an integer number (608968192824).

Almost surely, 2^{1217936385647} is an apocalyptic number.

1217936385647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217936385647 is an equidigital number, since it uses as much as digits as its factorization.

1217936385647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45722880, while the sum is 62.

The spelling of 1217936385647 in words is "one trillion, two hundred seventeen billion, nine hundred thirty-six million, three hundred eighty-five thousand, six hundred forty-seven".