1665600006 has 64 divisors (see below), whose sum is σ = 3924264960. Its totient is φ = 461427840.

The previous prime is 1665599987. The next prime is 1665600011. The reversal of 1665600006 is 6000065661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211296 + ... + 219036.

It is an arithmetic number, because the mean of its divisors is an integer number (61316640).

Almost surely, 2^1665600006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665600006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1962132480).

1665600006 is an abundant number, since it is smaller than the sum of its proper divisors (2258664954).

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

1665600006 is a wasteful number, since it uses less digits than its factorization.

1665600006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7909.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 1665600006 is about 40811.7630836993. The cubic root of 1665600006 is about 1185.3781143065.

Adding to 1665600006 its reverse (6000065661), we get a palindrome (7665665667).

The spelling of 1665600006 in words is "one billion, six hundred sixty-five million, six hundred thousand, six".