216215250065 has 4 divisors (see below), whose sum is σ = 259458300084. Its totient is φ = 172972200048.

The previous prime is 216215250061. The next prime is 216215250131. The reversal of 216215250065 is 560052512612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 117221325376 + 98993924689 = 342376^2 + 314633^2 .

It is a cyclic number.

It is not a de Polignac number, because 216215250065 - 2² = 216215250061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216215250061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21621525002 + ... + 21621525011.

It is an arithmetic number, because the mean of its divisors is an integer number (64864575021).

Almost surely, 2^216215250065 is an apocalyptic number.

It is an amenable number.

216215250065 is a deficient number, since it is larger than the sum of its proper divisors (43243050019).

216215250065 is an equidigital number, since it uses as much as digits as its factorization.

216215250065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43243050018.

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 216215250065 its reverse (560052512612), we get a palindrome (776267762677).

The spelling of 216215250065 in words is "two hundred sixteen billion, two hundred fifteen million, two hundred fifty thousand, sixty-five".