16640453 has 2 divisors, whose sum is σ = 16640454. Its totient is φ = 16640452.

The previous prime is 16640413. The next prime is 16640473. The reversal of 16640453 is 35404661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11546404 + 5094049 = 3398^2 + 2257^2 .

It is a cyclic number.

It is not a de Polignac number, because 16640453 - 2¹⁰ = 16639429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16640413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8320226 + 8320227.

It is an arithmetic number, because the mean of its divisors is an integer number (8320227).

Almost surely, 2^16640453 is an apocalyptic number.

It is an amenable number.

16640453 is a deficient number, since it is larger than the sum of its proper divisors (1).

16640453 is an equidigital number, since it uses as much as digits as its factorization.

16640453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 16640453 is about 4079.2711358771. The cubic root of 16640453 is about 255.3024886597.

The spelling of 16640453 in words is "sixteen million, six hundred forty thousand, four hundred fifty-three".