665570136 has 192 divisors, whose sum is σ = 2204340480. Its totient is φ = 165285120.

The previous prime is 665570107. The next prime is 665570141. The reversal of 665570136 is 631075566.

It is a junction number, because it is equal to n+sod(n) for n = 665570094 and 665570103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 296410 + ... + 298646.

It is an arithmetic number, because the mean of its divisors is an integer number (11480940).

Almost surely, 2^665570136 is an apocalyptic number.

665570136 is a gapful number since it is divisible by the number (66) 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 665570136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1102170240).

665570136 is an abundant number, since it is smaller than the sum of its proper divisors (1538770344).

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

665570136 is a wasteful number, since it uses less digits than its factorization.

665570136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294 (or 2283 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 665570136 is about 25798.6460109828. The cubic root of 665570136 is about 873.1012480176.

The spelling of 665570136 in words is "six hundred sixty-five million, five hundred seventy thousand, one hundred thirty-six".