665437560 has 128 divisors (see below), whose sum is σ = 2050997760. Its totient is φ = 172659200.

The previous prime is 665437547. The next prime is 665437571. The reversal of 665437560 is 65734566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 706690 + ... + 707630.

It is an arithmetic number, because the mean of its divisors is an integer number (16023420).

Almost surely, 2^665437560 is an apocalyptic number.

665437560 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 665437560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1025498880).

665437560 is an abundant number, since it is smaller than the sum of its proper divisors (1385560200).

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

665437560 is a wasteful number, since it uses less digits than its factorization.

665437560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 42.

The square root of 665437560 is about 25796.0764458473. The cubic root of 665437560 is about 873.0432726812.

The spelling of 665437560 in words is "six hundred sixty-five million, four hundred thirty-seven thousand, five hundred sixty".