665131564410 has 128 divisors (see below), whose sum is σ = 1674328195584. Its totient is φ = 168781578240.

The previous prime is 665131564399. The next prime is 665131564421. The reversal of 665131564410 is 14465131566.

It is an interprime number because it is at equal distance from previous prime (665131564399) and next prime (665131564421).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 282192952 + ... + 282195308.

It is an arithmetic number, because the mean of its divisors is an integer number (13080689028).

Almost surely, 2^665131564410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665131564410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (837164097792).

665131564410 is an abundant number, since it is smaller than the sum of its proper divisors (1009196631174).

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

665131564410 is a wasteful number, since it uses less digits than its factorization.

665131564410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4328.

The product of its (nonzero) digits is 259200, while the sum is 42.

Adding to 665131564410 its reverse (14465131566), we get a palindrome (679596695976).

The spelling of 665131564410 in words is "six hundred sixty-five billion, one hundred thirty-one million, five hundred sixty-four thousand, four hundred ten".