1665513210 has 96 divisors (see below), whose sum is σ = 4364979840. Its totient is φ = 406175616.

The previous prime is 1665513167. The next prime is 1665513217. The reversal of 1665513210 is 123155661.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1665513217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 311419 + ... + 316721.

It is an arithmetic number, because the mean of its divisors is an integer number (45468540).

Almost surely, 2^1665513210 is an apocalyptic number.

1665513210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665513210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2182489920).

1665513210 is an abundant number, since it is smaller than the sum of its proper divisors (2699466630).

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

1665513210 is a wasteful number, since it uses less digits than its factorization.

1665513210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5380 (or 5361 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1665513210 is about 40810.6996999561. The cubic root of 1665513210 is about 1185.3575235553.

Adding to 1665513210 its reverse (123155661), we get a palindrome (1788668871).

The spelling of 1665513210 in words is "one billion, six hundred sixty-five million, five hundred thirteen thousand, two hundred ten".