16656971 has 2 divisors, whose sum is σ = 16656972. Its totient is φ = 16656970.

The previous prime is 16656967. The next prime is 16656979. The reversal of 16656971 is 17965661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16656971 - 2² = 16656967 is a prime.

It is not a weakly prime, because it can be changed into another prime (16656979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8328485 + 8328486.

It is an arithmetic number, because the mean of its divisors is an integer number (8328486).

Almost surely, 2^16656971 is an apocalyptic number.

16656971 is a deficient number, since it is larger than the sum of its proper divisors (1).

16656971 is an equidigital number, since it uses as much as digits as its factorization.

16656971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 16656971 is about 4081.2952600859. The cubic root of 16656971 is about 255.3869353176.

The spelling of 16656971 in words is "sixteen million, six hundred fifty-six thousand, nine hundred seventy-one".