665749260 has 288 divisors, whose sum is σ = 2380976640. Its totient is φ = 154028160.

The previous prime is 665749247. The next prime is 665749289. The reversal of 665749260 is 62947566.

665749260 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1502599 + ... + 1503041.

It is an arithmetic number, because the mean of its divisors is an integer number (8267280).

Almost surely, 2^665749260 is an apocalyptic number.

665749260 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 665749260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1190488320).

665749260 is an abundant number, since it is smaller than the sum of its proper divisors (1715227380).

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

665749260 is a wasteful number, since it uses less digits than its factorization.

665749260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 665749260 is about 25802.1173549769. The cubic root of 665749260 is about 873.1795665156.

The spelling of 665749260 in words is "six hundred sixty-five million, seven hundred forty-nine thousand, two hundred sixty".