1665622101 has 16 divisors (see below), whose sum is σ = 2609087040. Its totient is φ = 931816320.

The previous prime is 1665622069. The next prime is 1665622109. The reversal of 1665622101 is 1012265661.

It is not a de Polignac number, because 1665622101 - 2⁵ = 1665622069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665622109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1940856 + ... + 1941713.

It is an arithmetic number, because the mean of its divisors is an integer number (163067940).

Almost surely, 2^1665622101 is an apocalyptic number.

1665622101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1665622101 is a deficient number, since it is larger than the sum of its proper divisors (943464939).

1665622101 is a wasteful number, since it uses less digits than its factorization.

1665622101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3882596.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1665622101 is about 40812.0337768164. The cubic root of 1665622101 is about 1185.3833558238.

Adding to 1665622101 its reverse (1012265661), we get a palindrome (2677887762).

The spelling of 1665622101 in words is "one billion, six hundred sixty-five million, six hundred twenty-two thousand, one hundred one".