16215165961 has 2 divisors, whose sum is σ = 16215165962. Its totient is φ = 16215165960.

The previous prime is 16215165929. The next prime is 16215165997. The reversal of 16215165961 is 16956151261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16013383936 + 201782025 = 126544^2 + 14205^2 .

It is a cyclic number.

It is not a de Polignac number, because 16215165961 - 2⁵ = 16215165929 is a prime.

It is not a weakly prime, because it can be changed into another prime (16215165361) by changing a digit.

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 as a sum of consecutive naturals, namely, 8107582980 + 8107582981.

It is an arithmetic number, because the mean of its divisors is an integer number (8107582981).

Almost surely, 2^16215165961 is an apocalyptic number.

It is an amenable number.

16215165961 is a deficient number, since it is larger than the sum of its proper divisors (1).

16215165961 is an equidigital number, since it uses as much as digits as its factorization.

16215165961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 43.

The spelling of 16215165961 in words is "sixteen billion, two hundred fifteen million, one hundred sixty-five thousand, nine hundred sixty-one".