665975620 has 48 divisors (see below), whose sum is σ = 1414078848. Its totient is φ = 263450880.

The previous prime is 665975579. The next prime is 665975621. The reversal of 665975620 is 26579566.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (665975621) 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, 915697 + ... + 916423.

It is an arithmetic number, because the mean of its divisors is an integer number (29459976).

Almost surely, 2^665975620 is an apocalyptic number.

It is an amenable number.

665975620 is an abundant number, since it is smaller than the sum of its proper divisors (748103228).

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

665975620 is a wasteful number, since it uses less digits than its factorization.

665975620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 46.

The square root of 665975620 is about 25806.5034438996. The cubic root of 665975620 is about 873.2785179485.

The spelling of 665975620 in words is "six hundred sixty-five million, nine hundred seventy-five thousand, six hundred twenty".