1620015666 has 8 divisors (see below), whose sum is σ = 3240031344. Its totient is φ = 540005220.

The previous prime is 1620015637. The next prime is 1620015673. The reversal of 1620015666 is 6665100261.

It is a sphenic number, since it is the product of 3 distinct primes.

1620015666 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135001300 + ... + 135001311.

It is an arithmetic number, because the mean of its divisors is an integer number (405003918).

Almost surely, 2^1620015666 is an apocalyptic number.

1620015666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1620015666 is a wasteful number, since it uses less digits than its factorization.

1620015666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270002616.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 1620015666 is about 40249.4182069754. The cubic root of 1620015666 is about 1174.4640781605.

The spelling of 1620015666 in words is "one billion, six hundred twenty million, fifteen thousand, six hundred sixty-six".