16653961 has 2 divisors, whose sum is σ = 16653962. Its totient is φ = 16653960.

The previous prime is 16653953. The next prime is 16653977. The reversal of 16653961 is 16935661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8497225 + 8156736 = 2915^2 + 2856^2 .

It is an emirp because it is prime and its reverse (16935661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16653961 - 2³ = 16653953 is a prime.

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 16653961.

It is not a weakly prime, because it can be changed into another prime (16653361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8326980 + 8326981.

It is an arithmetic number, because the mean of its divisors is an integer number (8326981).

Almost surely, 2^16653961 is an apocalyptic number.

It is an amenable number.

16653961 is a deficient number, since it is larger than the sum of its proper divisors (1).

16653961 is an equidigital number, since it uses as much as digits as its factorization.

16653961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 37.

The square root of 16653961 is about 4080.9264879436. The cubic root of 16653961 is about 255.3715511483.

The spelling of 16653961 in words is "sixteen million, six hundred fifty-three thousand, nine hundred sixty-one".