16664731 has 2 divisors, whose sum is σ = 16664732. Its totient is φ = 16664730.

The previous prime is 16664677. The next prime is 16664741. The reversal of 16664731 is 13746661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16664731 - 2¹¹ = 16662683 is a prime.

It is a super-2 number, since 2×16664731² = 555426518604722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16664741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332365 + 8332366.

It is an arithmetic number, because the mean of its divisors is an integer number (8332366).

Almost surely, 2^16664731 is an apocalyptic number.

16664731 is a deficient number, since it is larger than the sum of its proper divisors (1).

16664731 is an equidigital number, since it uses as much as digits as its factorization.

16664731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 16664731 is about 4082.2458279726. The cubic root of 16664731 is about 255.4265882842.

The spelling of 16664731 in words is "sixteen million, six hundred sixty-four thousand, seven hundred thirty-one".