216526520525 has 24 divisors (see below), whose sum is σ = 307394176704. Its totient is φ = 148211539200.

The previous prime is 216526520461. The next prime is 216526520543. The reversal of 216526520525 is 525025625612.

216526520525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216526520525 - 2⁶ = 216526520461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1000316 + ... + 1197365.

It is an arithmetic number, because the mean of its divisors is an integer number (12808090696).

Almost surely, 2^216526520525 is an apocalyptic number.

216526520525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216526520525 is a deficient number, since it is larger than the sum of its proper divisors (90867656179).

216526520525 is a wasteful number, since it uses less digits than its factorization.

216526520525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198261 (or 2198256 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 216526520525 in words is "two hundred sixteen billion, five hundred twenty-six million, five hundred twenty thousand, five hundred twenty-five".