665091227136 has 160 divisors (see below), whose sum is σ = 2042889032448. Its totient is φ = 188344074240.

The previous prime is 665091227123. The next prime is 665091227161. The reversal of 665091227136 is 631722190566.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 941271 + ... + 1488681.

Almost surely, 2^665091227136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665091227136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1021444516224).

665091227136 is an abundant number, since it is smaller than the sum of its proper divisors (1377797805312).

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

665091227136 is a wasteful number, since it uses less digits than its factorization.

665091227136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547552 (or 547536 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 48.

The spelling of 665091227136 in words is "six hundred sixty-five billion, ninety-one million, two hundred twenty-seven thousand, one hundred thirty-six".