2061655 has 16 divisors (see below), whose sum is σ = 2617344. Its totient is φ = 1556640.

The previous prime is 2061649. The next prime is 2061667. The reversal of 2061655 is 5561602.

2061655 = 186² + 187² + ... + 232².

It is not a de Polignac number, because 2061655 - 2⁵ = 2061623 is a prime.

It is a Duffinian number.

2061655 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7144 + ... + 7426.

It is an arithmetic number, because the mean of its divisors is an integer number (163584).

2^2061655 is an apocalyptic number.

2061655 is a deficient number, since it is larger than the sum of its proper divisors (555689).

2061655 is a wasteful number, since it uses less digits than its factorization.

2061655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2061655 is about 1435.8464402575. The cubic root of 2061655 is about 127.2736982765.

The spelling of 2061655 in words is "two million, sixty-one thousand, six hundred fifty-five".