2015550666 has 24 divisors (see below), whose sum is σ = 4596870720. Its totient is φ = 636489576.

The previous prime is 2015550643. The next prime is 2015550671. The reversal of 2015550666 is 6660555102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2015550666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2946370 + ... + 2947053.

It is an arithmetic number, because the mean of its divisors is an integer number (191536280).

Almost surely, 2^2015550666 is an apocalyptic number.

2015550666 is an abundant number, since it is smaller than the sum of its proper divisors (2581320054).

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

2015550666 is a wasteful number, since it uses less digits than its factorization.

2015550666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5893450 (or 5893447 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 2015550666 is about 44894.8846306570. The cubic root of 2015550666 is about 1263.1780582214.

The spelling of 2015550666 in words is "two billion, fifteen million, five hundred fifty thousand, six hundred sixty-six".