665411873712 has 160 divisors (see below), whose sum is σ = 1801100150784. Its totient is φ = 211447142400.

The previous prime is 665411873677. The next prime is 665411873717. The reversal of 665411873712 is 217378114566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (665411873717) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26692678 + ... + 26717594.

Almost surely, 2^665411873712 is an apocalyptic number.

665411873712 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665411873712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (900550075392).

665411873712 is an abundant number, since it is smaller than the sum of its proper divisors (1135688277072).

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

665411873712 is a wasteful number, since it uses less digits than its factorization.

665411873712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25227 (or 25221 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 51.

The spelling of 665411873712 in words is "six hundred sixty-five billion, four hundred eleven million, eight hundred seventy-three thousand, seven hundred twelve".