1661066 has 8 divisors (see below), whose sum is σ = 2718144. Its totient is φ = 755020.

The previous prime is 1661063. The next prime is 1661069. The reversal of 1661066 is 6601661.

1661066 = T₈₈ + T₈₉ + ... + T₂₁₉.

It is an interprime number because it is at equal distance from previous prime (1661063) and next prime (1661069).

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37730 + ... + 37773.

It is an arithmetic number, because the mean of its divisors is an integer number (339768).

2^1661066 is an apocalyptic number.

1661066 is a deficient number, since it is larger than the sum of its proper divisors (1057078).

1661066 is a wasteful number, since it uses less digits than its factorization.

1661066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75516.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1661066 is about 1288.8234945096. The cubic root of 1661066 is about 118.4301546186.

The spelling of 1661066 in words is "one million, six hundred sixty-one thousand, sixty-six".