16653977 has 2 divisors, whose sum is σ = 16653978. Its totient is φ = 16653976.

The previous prime is 16653961. The next prime is 16653979. The reversal of 16653977 is 77935661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15452761 + 1201216 = 3931^2 + 1096^2 .

It is a cyclic number.

It is not a de Polignac number, because 16653977 - 2⁴ = 16653961 is a prime.

Together with 16653979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16653979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8326988 + 8326989.

It is an arithmetic number, because the mean of its divisors is an integer number (8326989).

Almost surely, 2^16653977 is an apocalyptic number.

It is an amenable number.

16653977 is a deficient number, since it is larger than the sum of its proper divisors (1).

16653977 is an equidigital number, since it uses as much as digits as its factorization.

16653977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 238140, while the sum is 44.

The square root of 16653977 is about 4080.9284482823. The cubic root of 16653977 is about 255.3716329296.

The spelling of 16653977 in words is "sixteen million, six hundred fifty-three thousand, nine hundred seventy-seven".