1216166425 has 24 divisors (see below), whose sum is σ = 1560257280. Its totient is φ = 939393600.

The previous prime is 1216166401. The next prime is 1216166443. The reversal of 1216166425 is 5246616121.

It is not a de Polignac number, because 1216166425 - 2⁷ = 1216166297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 392934 + ... + 396016.

It is an arithmetic number, because the mean of its divisors is an integer number (65010720).

Almost surely, 2^1216166425 is an apocalyptic number.

It is an amenable number.

1216166425 is a deficient number, since it is larger than the sum of its proper divisors (344090855).

1216166425 is a wasteful number, since it uses less digits than its factorization.

1216166425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633 (or 3628 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 1216166425 is about 34873.5777487771. The cubic root of 1216166425 is about 1067.4093512088.

The spelling of 1216166425 in words is "one billion, two hundred sixteen million, one hundred sixty-six thousand, four hundred twenty-five".