1215775511647 has 2 divisors, whose sum is σ = 1215775511648. Its totient is φ = 1215775511646.

The previous prime is 1215775511611. The next prime is 1215775511677. The reversal of 1215775511647 is 7461155775121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215775511647 is a prime.

It is a super-2 number, since 2×1215775511647² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1215775511594 and 1215775511603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215775511677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607887755823 + 607887755824.

It is an arithmetic number, because the mean of its divisors is an integer number (607887755824).

Almost surely, 2^{1215775511647} is an apocalyptic number.

1215775511647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215775511647 is an equidigital number, since it uses as much as digits as its factorization.

1215775511647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2058000, while the sum is 52.

The spelling of 1215775511647 in words is "one trillion, two hundred fifteen billion, seven hundred seventy-five million, five hundred eleven thousand, six hundred forty-seven".