665263020 has 48 divisors (see below), whose sum is σ = 1865511648. Its totient is φ = 177139200.

The previous prime is 665263013. The next prime is 665263021. The reversal of 665263020 is 20362566.

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 (665263021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34152 + ... + 49968.

It is an arithmetic number, because the mean of its divisors is an integer number (38864826).

Almost surely, 2^665263020 is an apocalyptic number.

665263020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665263020 is an abundant number, since it is smaller than the sum of its proper divisors (1200248628).

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

665263020 is a wasteful number, since it uses less digits than its factorization.

665263020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16530 (or 16528 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 665263020 is about 25792.6931513559. The cubic root of 665263020 is about 872.9669347913.

The spelling of 665263020 in words is "six hundred sixty-five million, two hundred sixty-three thousand, twenty".