1217666903966 has 4 divisors (see below), whose sum is σ = 1826500355952. Its totient is φ = 608833451982.

The previous prime is 1217666903911. The next prime is 1217666903987. The reversal of 1217666903966 is 6693096667121.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 1217666903899 and 1217666903908.

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, 304416725990 + ... + 304416725993.

It is an arithmetic number, because the mean of its divisors is an integer number (456625088988).

Almost surely, 2^{1217666903966} is an apocalyptic number.

1217666903966 is a deficient number, since it is larger than the sum of its proper divisors (608833451986).

1217666903966 is an equidigital number, since it uses as much as digits as its factorization.

1217666903966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608833451985.

The product of its (nonzero) digits is 26453952, while the sum is 62.

The spelling of 1217666903966 in words is "one trillion, two hundred seventeen billion, six hundred sixty-six million, nine hundred three thousand, nine hundred sixty-six".