16661434 has 8 divisors (see below), whose sum is σ = 25018740. Its totient is φ = 8321856.

The previous prime is 16661431. The next prime is 16661443. The reversal of 16661434 is 43416661.

It can be written as a sum of positive squares in 2 ways, for example, as 15233409 + 1428025 = 3903^2 + 1195^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 16661396 and 16661405.

It is not an unprimeable number, because it can be changed into a prime (16661431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1759 + ... + 6034.

Almost surely, 2^16661434 is an apocalyptic number.

16661434 is a deficient number, since it is larger than the sum of its proper divisors (8357306).

16661434 is a wasteful number, since it uses less digits than its factorization.

16661434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8864.

The product of its digits is 10368, while the sum is 31.

The square root of 16661434 is about 4081.8419861626. The cubic root of 16661434 is about 255.4097423876.

The spelling of 16661434 in words is "sixteen million, six hundred sixty-one thousand, four hundred thirty-four".