16566457 has 2 divisors, whose sum is σ = 16566458. Its totient is φ = 16566456.

The previous prime is 16566443. The next prime is 16566467. The reversal of 16566457 is 75466561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16353936 + 212521 = 4044^2 + 461^2 .

It is an emirp because it is prime and its reverse (75466561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16566457 - 2¹⁵ = 16533689 is a prime.

It is not a weakly prime, because it can be changed into another prime (16566427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8283228 + 8283229.

It is an arithmetic number, because the mean of its divisors is an integer number (8283229).

Almost surely, 2^16566457 is an apocalyptic number.

It is an amenable number.

16566457 is a deficient number, since it is larger than the sum of its proper divisors (1).

16566457 is an equidigital number, since it uses as much as digits as its factorization.

16566457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 40.

The square root of 16566457 is about 4070.1912731468. The cubic root of 16566457 is about 254.9235039033.

The spelling of 16566457 in words is "sixteen million, five hundred sixty-six thousand, four hundred fifty-seven".