665962920 has 288 divisors, whose sum is σ = 2651594400. Its totient is φ = 144135936.

The previous prime is 665962897. The next prime is 665962937. The reversal of 665962920 is 29269566.

665962920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×665962920² = 887013221629852800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 334167 + ... + 336153.

It is an arithmetic number, because the mean of its divisors is an integer number (9206925).

Almost surely, 2^665962920 is an apocalyptic number.

665962920 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 665962920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1325797200).

665962920 is an abundant number, since it is smaller than the sum of its proper divisors (1985631480).

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

665962920 is a wasteful number, since it uses less digits than its factorization.

665962920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037 (or 2023 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 665962920 is about 25806.2573807207. The cubic root of 665962920 is about 873.2729668405.

The spelling of 665962920 in words is "six hundred sixty-five million, nine hundred sixty-two thousand, nine hundred twenty".