16657493 has 2 divisors, whose sum is σ = 16657494. Its totient is φ = 16657492.

The previous prime is 16657477. The next prime is 16657499. The reversal of 16657493 is 39475661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14691889 + 1965604 = 3833^2 + 1402^2 .

It is a cyclic number.

It is not a de Polignac number, because 16657493 - 2⁴ = 16657477 is a prime.

It is a super-3 number, since 3×16657493³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16657493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16657499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8328746 + 8328747.

It is an arithmetic number, because the mean of its divisors is an integer number (8328747).

Almost surely, 2^16657493 is an apocalyptic number.

It is an amenable number.

16657493 is a deficient number, since it is larger than the sum of its proper divisors (1).

16657493 is an equidigital number, since it uses as much as digits as its factorization.

16657493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 41.

The square root of 16657493 is about 4081.3592098711. The cubic root of 16657493 is about 255.3896030813.

The spelling of 16657493 in words is "sixteen million, six hundred fifty-seven thousand, four hundred ninety-three".