16653397 has 2 divisors, whose sum is σ = 16653398. Its totient is φ = 16653396.

The previous prime is 16653379. The next prime is 16653419. The reversal of 16653397 is 79335661.

Together with previous prime (16653379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14676561 + 1976836 = 3831^2 + 1406^2 .

It is an emirp because it is prime and its reverse (79335661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16653397 - 2⁷ = 16653269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16653697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8326698 + 8326699.

It is an arithmetic number, because the mean of its divisors is an integer number (8326699).

Almost surely, 2^16653397 is an apocalyptic number.

It is an amenable number.

16653397 is a deficient number, since it is larger than the sum of its proper divisors (1).

16653397 is an equidigital number, since it uses as much as digits as its factorization.

16653397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 40.

The square root of 16653397 is about 4080.8573854032. The cubic root of 16653397 is about 255.3686683270.

The spelling of 16653397 in words is "sixteen million, six hundred fifty-three thousand, three hundred ninety-seven".