216573576025 has 6 divisors (see below), whose sum is σ = 268551234302. Its totient is φ = 173258860800.

The previous prime is 216573576007. The next prime is 216573576029. The reversal of 216573576025 is 520675375612.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 24105357081 + 192468218944 = 155259^2 + 438712^2 .

It is not a de Polignac number, because 216573576025 - 2²³ = 216565187417 is a prime.

It is a super-2 number, since 2×216573576025² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216573576025.

It is not an unprimeable number, because it can be changed into a prime (216573576029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4331471496 + ... + 4331471545.

Almost surely, 2^216573576025 is an apocalyptic number.

216573576025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216573576025 is a deficient number, since it is larger than the sum of its proper divisors (51977658277).

216573576025 is an equidigital number, since it uses as much as digits as its factorization.

216573576025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8662943051 (or 8662943046 counting only the distinct ones).

The product of its (nonzero) digits is 2646000, while the sum is 49.

The spelling of 216573576025 in words is "two hundred sixteen billion, five hundred seventy-three million, five hundred seventy-six thousand, twenty-five".