16661057 has 8 divisors (see below), whose sum is σ = 19084800. Its totient is φ = 14248224.

The previous prime is 16660979. The next prime is 16661083. The reversal of 16661057 is 75016661.

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

It is a cyclic number.

It is not a de Polignac number, because 16661057 - 2¹⁶ = 16595521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16661087) 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 7 ways as a sum of consecutive naturals, for example, 869 + ... + 5837.

It is an arithmetic number, because the mean of its divisors is an integer number (2385600).

Almost surely, 2^16661057 is an apocalyptic number.

It is an amenable number.

16661057 is a deficient number, since it is larger than the sum of its proper divisors (2423743).

16661057 is an equidigital number, since it uses as much as digits as its factorization.

16661057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5455.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 16661057 is about 4081.7958057698. The cubic root of 16661057 is about 255.4078159788.

The spelling of 16661057 in words is "sixteen million, six hundred sixty-one thousand, fifty-seven".