16556461 has 2 divisors, whose sum is σ = 16556462. Its totient is φ = 16556460.

The previous prime is 16556443. The next prime is 16556483. The reversal of 16556461 is 16465561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13003236 + 3553225 = 3606^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 16556461 - 2¹³ = 16548269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16550461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278230 + 8278231.

It is an arithmetic number, because the mean of its divisors is an integer number (8278231).

Almost surely, 2^16556461 is an apocalyptic number.

It is an amenable number.

16556461 is a deficient number, since it is larger than the sum of its proper divisors (1).

16556461 is an equidigital number, since it uses as much as digits as its factorization.

16556461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 16556461 is about 4068.9631357386. The cubic root of 16556461 is about 254.8722210000.

The spelling of 16556461 in words is "sixteen million, five hundred fifty-six thousand, four hundred sixty-one".