1665650115 has 32 divisors (see below), whose sum is σ = 2966103360. Its totient is φ = 886862592.

The previous prime is 1665650101. The next prime is 1665650117. The reversal of 1665650115 is 5110565661.

It is not a de Polignac number, because 1665650115 - 2¹⁹ = 1665125827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1665650115.

It is not an unprimeable number, because it can be changed into a prime (1665650117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73297 + ... + 93293.

It is an arithmetic number, because the mean of its divisors is an integer number (92690730).

Almost surely, 2^1665650115 is an apocalyptic number.

1665650115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1665650115 is a deficient number, since it is larger than the sum of its proper divisors (1300453245).

1665650115 is a wasteful number, since it uses less digits than its factorization.

1665650115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20628 (or 20622 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1665650115 is about 40812.3769829693. The cubic root of 1665650115 is about 1185.3900014174.

The spelling of 1665650115 in words is "one billion, six hundred sixty-five million, six hundred fifty thousand, one hundred fifteen".