16661722 has 16 divisors (see below), whose sum is σ = 31159872. Its totient is φ = 6491520.

The previous prime is 16661713. The next prime is 16661741. The reversal of 16661722 is 22716661.

It is a happy number.

It is a super-2 number, since 2×16661722² = 555225960010568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53943 + ... + 54250.

It is an arithmetic number, because the mean of its divisors is an integer number (1947492).

Almost surely, 2^16661722 is an apocalyptic number.

16661722 is a deficient number, since it is larger than the sum of its proper divisors (14498150).

16661722 is a wasteful number, since it uses less digits than its factorization.

16661722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108213.

The product of its digits is 6048, while the sum is 31.

The square root of 16661722 is about 4081.8772642009. The cubic root of 16661722 is about 255.4112140013.

The spelling of 16661722 in words is "sixteen million, six hundred sixty-one thousand, seven hundred twenty-two".