16366261 has 2 divisors, whose sum is σ = 16366262. Its totient is φ = 16366260.

The previous prime is 16366253. The next prime is 16366289. The reversal of 16366261 is 16266361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14205361 + 2160900 = 3769^2 + 1470^2 .

It is a cyclic number.

It is not a de Polignac number, because 16366261 - 2³ = 16366253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16366211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8183130 + 8183131.

It is an arithmetic number, because the mean of its divisors is an integer number (8183131).

Almost surely, 2^16366261 is an apocalyptic number.

It is an amenable number.

16366261 is a deficient number, since it is larger than the sum of its proper divisors (1).

16366261 is an equidigital number, since it uses as much as digits as its factorization.

16366261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The square root of 16366261 is about 4045.5235755091. The cubic root of 16366261 is about 253.8924721041.

It can be divided in two parts, 16 and 366261, that multiplied together give a triangular number (5860176 = T₃₄₂₃).

The spelling of 16366261 in words is "sixteen million, three hundred sixty-six thousand, two hundred sixty-one".