16668722 has 24 divisors (see below), whose sum is σ = 29877804. Its totient is φ = 6949152.

The previous prime is 16668713. The next prime is 16668727. The reversal of 16668722 is 22786661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16654561 + 14161 = 4081^2 + 119^2 .

It is a super-2 number, since 2×16668722² = 555692586226568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16668727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1328 + ... + 5924.

Almost surely, 2^16668722 is an apocalyptic number.

16668722 is a deficient number, since it is larger than the sum of its proper divisors (13209082).

16668722 is a wasteful number, since it uses less digits than its factorization.

16668722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4650 (or 4643 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 16668722 is about 4082.7346227743. The cubic root of 16668722 is about 255.4469771751.

The spelling of 16668722 in words is "sixteen million, six hundred sixty-eight thousand, seven hundred twenty-two".