665424900 has 324 divisors, whose sum is σ = 2469841920. Its totient is φ = 149385600.

The previous prime is 665424883. The next prime is 665424917. The reversal of 665424900 is 9424566.

It is an interprime number because it is at equal distance from previous prime (665424883) and next prime (665424917).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 3483805 + ... + 3483995.

Almost surely, 2^665424900 is an apocalyptic number.

665424900 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 665424900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1234920960).

665424900 is an abundant number, since it is smaller than the sum of its proper divisors (1804417020).

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

665424900 is a wasteful number, since it uses less digits than its factorization.

665424900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 665424900 is about 25795.8310585257. The cubic root of 665424900 is about 873.0377360746.

The spelling of 665424900 in words is "six hundred sixty-five million, four hundred twenty-four thousand, nine hundred".