665131025010 has 16 divisors (see below), whose sum is σ = 1596314460096. Its totient is φ = 177368273328.

The previous prime is 665131024979. The next prime is 665131025011. The reversal of 665131025010 is 10520131566.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 22171034167 = 665131025010 / (6 + 6 + 5 + 1 + 3 + 1 + 0 + 2 + 5 + 0 + 1 + 0).

It is not an unprimeable number, because it can be changed into a prime (665131025011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11085517054 + ... + 11085517113.

It is an arithmetic number, because the mean of its divisors is an integer number (99769653756).

Almost surely, 2^665131025010 is an apocalyptic number.

665131025010 is an abundant number, since it is smaller than the sum of its proper divisors (931183435086).

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

665131025010 is a wasteful number, since it uses less digits than its factorization.

665131025010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22171034177.

The product of its (nonzero) digits is 5400, while the sum is 30.

Adding to 665131025010 its reverse (10520131566), we get a palindrome (675651156576).

The spelling of 665131025010 in words is "six hundred sixty-five billion, one hundred thirty-one million, twenty-five thousand, ten".