665990088 has 32 divisors (see below), whose sum is σ = 1671135360. Its totient is φ = 221175360.

The previous prime is 665990077. The next prime is 665990099. The reversal of 665990088 is 880099566.

665990088 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (665990077) and next prime (665990099).

It is a self number, because there is not a number n which added to its sum of digits gives 665990088.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44695 + ... + 57702.

It is an arithmetic number, because the mean of its divisors is an integer number (52222980).

Almost surely, 2^665990088 is an apocalyptic number.

It is an amenable number.

665990088 is an abundant number, since it is smaller than the sum of its proper divisors (1005145272).

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

665990088 is a wasteful number, since it uses less digits than its factorization.

665990088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102677 (or 102673 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 51.

The square root of 665990088 is about 25806.7837593141. The cubic root of 665990088 is about 873.2848417546.

The spelling of 665990088 in words is "six hundred sixty-five million, nine hundred ninety thousand, eighty-eight".