16720553 has 2 divisors, whose sum is σ = 16720554. Its totient is φ = 16720552.

The previous prime is 16720549. The next prime is 16720567. The reversal of 16720553 is 35502761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14684224 + 2036329 = 3832^2 + 1427^2 .

It is a cyclic number.

It is not a de Polignac number, because 16720553 - 2² = 16720549 is a prime.

It is not a weakly prime, because it can be changed into another prime (16720573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360276 + 8360277.

It is an arithmetic number, because the mean of its divisors is an integer number (8360277).

Almost surely, 2^16720553 is an apocalyptic number.

It is an amenable number.

16720553 is a deficient number, since it is larger than the sum of its proper divisors (1).

16720553 is an equidigital number, since it uses as much as digits as its factorization.

16720553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 16720553 is about 4089.0772797784. The cubic root of 16720553 is about 255.7114720116.

The spelling of 16720553 in words is "sixteen million, seven hundred twenty thousand, five hundred fifty-three".