665054245120 has 72 divisors (see below), whose sum is σ = 1593497024280. Its totient is φ = 265940828160.

The previous prime is 665054245081. The next prime is 665054245151. The reversal of 665054245120 is 21542450566.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 153062477824 + 511991767296 = 391232^2 + 715536^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4224786 + ... + 4379374.

It is an arithmetic number, because the mean of its divisors is an integer number (22131903115).

Almost surely, 2^665054245120 is an apocalyptic number.

It is an amenable number.

665054245120 is an abundant number, since it is smaller than the sum of its proper divisors (928442779160).

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

665054245120 is a wasteful number, since it uses less digits than its factorization.

665054245120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157971 (or 157957 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 40.

Adding to 665054245120 its reverse (21542450566), we get a palindrome (686596695686).

The spelling of 665054245120 in words is "six hundred sixty-five billion, fifty-four million, two hundred forty-five thousand, one hundred twenty".