1216230616525 has 12 divisors (see below), whose sum is σ = 1517731867252. Its totient is φ = 966787136640.

The previous prime is 1216230616507. The next prime is 1216230616541. The reversal of 1216230616525 is 5256160326121.

It can be written as a sum of positive squares in 6 ways, for example, as 156687722244 + 1059542894281 = 395838^2 + 1029341^2 .

It is not a de Polignac number, because 1216230616525 - 2³⁵ = 1181870878157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154929912 + ... + 154937761.

Almost surely, 2^{1216230616525} is an apocalyptic number.

It is an amenable number.

1216230616525 is a deficient number, since it is larger than the sum of its proper divisors (301501250727).

1216230616525 is a wasteful number, since it uses less digits than its factorization.

1216230616525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309867840 (or 309867835 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 1216230616525 in words is "one trillion, two hundred sixteen billion, two hundred thirty million, six hundred sixteen thousand, five hundred twenty-five".