102001665 has 32 divisors (see below), whose sum is σ = 171383040. Its totient is φ = 51704576.

The previous prime is 102001661. The next prime is 102001667. The reversal of 102001665 is 566100201.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 102001665 - 2² = 102001661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102001661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58831 + ... + 60539.

It is an arithmetic number, because the mean of its divisors is an integer number (5355720).

Almost surely, 2^102001665 is an apocalyptic number.

102001665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

102001665 is a deficient number, since it is larger than the sum of its proper divisors (69381375).

102001665 is a wasteful number, since it uses less digits than its factorization.

102001665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 102001665 is about 10099.5873678086. The cubic root of 102001665 is about 467.2354151182.

Adding to 102001665 its reverse (566100201), we get a palindrome (668101866).

The spelling of 102001665 in words is "one hundred two million, one thousand, six hundred sixty-five".