1665251112 has 64 divisors (see below), whose sum is σ = 4818124800. Its totient is φ = 469759680.

The previous prime is 1665251101. The next prime is 1665251113. The reversal of 1665251112 is 2111525661.

It is a super-2 number, since 2×1665251112² = 5546122532034473088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1665251112.

It is not an unprimeable number, because it can be changed into a prime (1665251113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49464 + ... + 76007.

It is an arithmetic number, because the mean of its divisors is an integer number (75283200).

Almost surely, 2^1665251112 is an apocalyptic number.

1665251112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1665251112 is an abundant number, since it is smaller than the sum of its proper divisors (3152873688).

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

1665251112 is a wasteful number, since it uses less digits than its factorization.

1665251112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125566 (or 125562 counting only the distinct ones).

The product of its digits is 3600, while the sum is 30.

The square root of 1665251112 is about 40807.4884304339. The cubic root of 1665251112 is about 1185.2953412936.

Adding to 1665251112 its reverse (2111525661), we get a palindrome (3776776773).

The spelling of 1665251112 in words is "one billion, six hundred sixty-five million, two hundred fifty-one thousand, one hundred twelve".