1665795516 has 192 divisors, whose sum is σ = 5112446976. Its totient is φ = 409305600.

The previous prime is 1665795499. The next prime is 1665795517. The reversal of 1665795516 is 6155975661.

It is a super-2 number, since 2×1665795516² = 5549749402251412512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665795517) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2188576 + ... + 2189336.

It is an arithmetic number, because the mean of its divisors is an integer number (26627328).

Almost surely, 2^1665795516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665795516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2556223488).

1665795516 is an abundant number, since it is smaller than the sum of its proper divisors (3446651460).

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

1665795516 is a wasteful number, since it uses less digits than its factorization.

1665795516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912 (or 910 counting only the distinct ones).

The product of its digits is 1701000, while the sum is 51.

The square root of 1665795516 is about 40814.1582787150. The cubic root of 1665795516 is about 1185.4244928302.

The spelling of 1665795516 in words is "one billion, six hundred sixty-five million, seven hundred ninety-five thousand, five hundred sixteen".