1665861016 has 16 divisors (see below), whose sum is σ = 3125208240. Its totient is φ = 832472160.

The previous prime is 1665860983. The next prime is 1665861023. The reversal of 1665861016 is 6101685661.

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 1665861016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41595 + ... + 71146.

It is an arithmetic number, because the mean of its divisors is an integer number (195325515).

Almost surely, 2^1665861016 is an apocalyptic number.

It is an amenable number.

1665861016 is a deficient number, since it is larger than the sum of its proper divisors (1459347224).

1665861016 is a wasteful number, since it uses less digits than its factorization.

1665861016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114594 (or 114590 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 1665861016 is about 40814.9606884534. The cubic root of 1665861016 is about 1185.4400298085.

The spelling of 1665861016 in words is "one billion, six hundred sixty-five million, eight hundred sixty-one thousand, sixteen".