1661016 has 32 divisors (see below), whose sum is σ = 4746240. Its totient is φ = 474528.

The previous prime is 1661003. The next prime is 1661021. The reversal of 1661016 is 6101661.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1660983 and 1661001.

It is a congruent number.

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, 4776 + ... + 5111.

It is an arithmetic number, because the mean of its divisors is an integer number (148320).

2^1661016 is an apocalyptic number.

It is an amenable number.

1661016 is an abundant number, since it is smaller than the sum of its proper divisors (3085224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661016 is a wasteful number, since it uses less digits than its factorization.

1661016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9903 (or 9899 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1661016 is about 1288.8040968278. The cubic root of 1661016 is about 118.4289663119.

Adding to 1661016 its reverse (6101661), we get a palindrome (7762677).

The spelling of 1661016 in words is "one million, six hundred sixty-one thousand, sixteen".