1217204117816 has 8 divisors (see below), whose sum is σ = 2282257720920. Its totient is φ = 608602058904.

The previous prime is 1217204117807. The next prime is 1217204117897. The reversal of 1217204117816 is 6187114027121.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76075257356 + ... + 76075257371.

It is an arithmetic number, because the mean of its divisors is an integer number (285282215115).

Almost surely, 2^{1217204117816} is an apocalyptic number.

It is an amenable number.

1217204117816 is a deficient number, since it is larger than the sum of its proper divisors (1065053603104).

1217204117816 is a wasteful number, since it uses less digits than its factorization.

1217204117816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152150514733 (or 152150514729 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 41.

The spelling of 1217204117816 in words is "one trillion, two hundred seventeen billion, two hundred four million, one hundred seventeen thousand, eight hundred sixteen".