1216656532 has 48 divisors (see below), whose sum is σ = 2623828480. Its totient is φ = 480701952.

The previous prime is 1216656503. The next prime is 1216656541. The reversal of 1216656532 is 2356566121.

It is a junction number, because it is equal to n+sod(n) for n = 1216656491 and 1216656500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376588 + ... + 379804.

Almost surely, 2^1216656532 is an apocalyptic number.

It is an amenable number.

1216656532 is an abundant number, since it is smaller than the sum of its proper divisors (1407171948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216656532 is a wasteful number, since it uses less digits than its factorization.

1216656532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4280 (or 4278 counting only the distinct ones).

The product of its digits is 64800, while the sum is 37.

The square root of 1216656532 is about 34880.6039511933. The cubic root of 1216656532 is about 1067.5527182472.

The spelling of 1216656532 in words is "one billion, two hundred sixteen million, six hundred fifty-six thousand, five hundred thirty-two".