665620623360 has 1664 divisors, whose sum is σ = 3002167941120. Its totient is φ = 137594142720.

The previous prime is 665620623359. The next prime is 665620623361. The reversal of 665620623360 is 63326026566.

665620623360 is a `hidden beast` number, since 6 + 6 + 562 + 0 + 6 + 23 + 3 + 60 = 666.

It is an interprime number because it is at equal distance from previous prime (665620623359) and next prime (665620623361).

It is a super-3 number, since 3×665620623360³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665620623361) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3448811424 + ... + 3448811616.

Almost surely, 2^665620623360 is an apocalyptic number.

665620623360 is a gapful number since it is divisible by the number (60) 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 665620623360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1501083970560).

665620623360 is an abundant number, since it is smaller than the sum of its proper divisors (2336547317760).

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

665620623360 is an equidigital number, since it uses as much as digits as its factorization.

665620623360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 45.

The spelling of 665620623360 in words is "six hundred sixty-five billion, six hundred twenty million, six hundred twenty-three thousand, three hundred sixty".