665133100 has 36 divisors (see below), whose sum is σ = 1451719584. Its totient is φ = 264508480.

The previous prime is 665133097. The next prime is 665133101. The reversal of 665133100 is 1331566.

It is a super-2 number, since 2×665133100² = 884804081431220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (665133101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1924 + ... + 36523.

It is an arithmetic number, because the mean of its divisors is an integer number (40325544).

Almost surely, 2^665133100 is an apocalyptic number.

It is an amenable number.

665133100 is an abundant number, since it is smaller than the sum of its proper divisors (786586484).

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

665133100 is a wasteful number, since it uses less digits than its factorization.

665133100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38634 (or 38627 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 665133100 is about 25790.1744856447. The cubic root of 665133100 is about 872.9101035107.

Adding to 665133100 its reverse (1331566), we get a palindrome (666464666).

The spelling of 665133100 in words is "six hundred sixty-five million, one hundred thirty-three thousand, one hundred".