1217660069809 has 16 divisors (see below), whose sum is σ = 1231042538880. Its totient is φ = 1204319664000.

The previous prime is 1217660069779. The next prime is 1217660069837. The reversal of 1217660069809 is 9089600667121.

It is a cyclic number.

It is not a de Polignac number, because 1217660069809 - 2²³ = 1217651681201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1217660069809.

It is not an unprimeable number, because it can be changed into a prime (1217660069839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239647149 + ... + 239652229.

It is an arithmetic number, because the mean of its divisors is an integer number (76940158680).

Almost surely, 2^{1217660069809} is an apocalyptic number.

It is an amenable number.

1217660069809 is a deficient number, since it is larger than the sum of its proper divisors (13382469071).

1217660069809 is a wasteful number, since it uses less digits than its factorization.

1217660069809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8712.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 1217660069809 in words is "one trillion, two hundred seventeen billion, six hundred sixty million, sixty-nine thousand, eight hundred nine".