1616661 has 12 divisors (see below), whose sum is σ = 2347488. Its totient is φ = 1072104.

The previous prime is 1616651. The next prime is 1616669. The reversal of 1616661 is 1666161.

It is not a de Polignac number, because 1616661 - 2⁶ = 1616597 is a prime.

It is a super-2 number, since 2×1616661² = 5227185577842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2026 + ... + 2708.

It is an arithmetic number, because the mean of its divisors is an integer number (195624).

2^1616661 is an apocalyptic number.

It is an amenable number.

1616661 is a deficient number, since it is larger than the sum of its proper divisors (730827).

1616661 is a wasteful number, since it uses less digits than its factorization.

1616661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952 (or 949 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1616661 is about 1271.4798464781. The cubic root of 1616661 is about 117.3652839627.

The spelling of 1616661 in words is "one million, six hundred sixteen thousand, six hundred sixty-one".