215700560261 has 2 divisors, whose sum is σ = 215700560262. Its totient is φ = 215700560260.

The previous prime is 215700560239. The next prime is 215700560263. The reversal of 215700560261 is 162065007512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162429150625 + 53271409636 = 403025^2 + 230806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215700560261 is a prime.

Together with 215700560263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215700560263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107850280130 + 107850280131.

It is an arithmetic number, because the mean of its divisors is an integer number (107850280131).

Almost surely, 2^215700560261 is an apocalyptic number.

It is an amenable number.

215700560261 is a deficient number, since it is larger than the sum of its proper divisors (1).

215700560261 is an equidigital number, since it uses as much as digits as its factorization.

215700560261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 35.

Adding to 215700560261 its reverse (162065007512), we get a palindrome (377765567773).

The spelling of 215700560261 in words is "two hundred fifteen billion, seven hundred million, five hundred sixty thousand, two hundred sixty-one".