215615317752061 has 2 divisors, whose sum is σ = 215615317752062. Its totient is φ = 215615317752060.

The previous prime is 215615317752019. The next prime is 215615317752071. The reversal of 215615317752061 is 160257713516512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117492722432836 + 98122595319225 = 10839406^2 + 9905685^2 .

It is a cyclic number.

It is not a de Polignac number, because 215615317752061 - 2¹⁹ = 215615317227773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215615317752001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107807658876030 + 107807658876031.

It is an arithmetic number, because the mean of its divisors is an integer number (107807658876031).

Almost surely, 2^{215615317752061} is an apocalyptic number.

It is an amenable number.

215615317752061 is a deficient number, since it is larger than the sum of its proper divisors (1).

215615317752061 is an equidigital number, since it uses as much as digits as its factorization.

215615317752061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646000, while the sum is 52.

The spelling of 215615317752061 in words is "two hundred fifteen trillion, six hundred fifteen billion, three hundred seventeen million, seven hundred fifty-two thousand, sixty-one".