1216526652 has 72 divisors (see below), whose sum is σ = 3363093552. Its totient is φ = 367718400.

The previous prime is 1216526651. The next prime is 1216526659. The reversal of 1216526652 is 2566256121.

1216526652 is a `hidden beast` number, since 121 + 6 + 526 + 6 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216526651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163068 + ... + 170364.

Almost surely, 2^1216526652 is an apocalyptic number.

1216526652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216526652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1681546776).

1216526652 is an abundant number, since it is smaller than the sum of its proper divisors (2146566900).

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

1216526652 is a wasteful number, since it uses less digits than its factorization.

1216526652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7739 (or 7734 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1216526652 is about 34878.7421218140. The cubic root of 1216526652 is about 1067.5147292510.

The spelling of 1216526652 in words is "one billion, two hundred sixteen million, five hundred twenty-six thousand, six hundred fifty-two".