2061615666 has 24 divisors (see below), whose sum is σ = 4532148432. Its totient is φ = 624731800.

The previous prime is 2061615659. The next prime is 2061615667. The reversal of 2061615666 is 6665161602.

It is not an unprimeable number, because it can be changed into a prime (2061615667) 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, 1419120 + ... + 1420571.

It is an arithmetic number, because the mean of its divisors is an integer number (188839518).

Almost surely, 2^2061615666 is an apocalyptic number.

2061615666 is an abundant number, since it is smaller than the sum of its proper divisors (2470532766).

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

2061615666 is a wasteful number, since it uses less digits than its factorization.

2061615666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2839718 (or 2839707 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 2061615666 is about 45405.0180706935. The cubic root of 2061615666 is about 1272.7288885950.

The spelling of 2061615666 in words is "two billion, sixty-one million, six hundred fifteen thousand, six hundred sixty-six".