1216065916 has 24 divisors (see below), whose sum is σ = 2303352800. Its totient is φ = 558436032.

The previous prime is 1216065899. The next prime is 1216065931. The reversal of 1216065916 is 6195606121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48411 + ... + 69106.

Almost surely, 2^1216065916 is an apocalyptic number.

It is an amenable number.

1216065916 is a deficient number, since it is larger than the sum of its proper divisors (1087286884).

1216065916 is a wasteful number, since it uses less digits than its factorization.

1216065916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117733 (or 117731 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 1216065916 is about 34872.1366709871. The cubic root of 1216065916 is about 1067.3799453643.

The spelling of 1216065916 in words is "one billion, two hundred sixteen million, sixty-five thousand, nine hundred sixteen".