665342040 has 64 divisors (see below), whose sum is σ = 2177487360. Its totient is φ = 161294720.

The previous prime is 665342033. The next prime is 665342047. The reversal of 665342040 is 40243566.

It is an interprime number because it is at equal distance from previous prime (665342033) and next prime (665342047).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 665341989 and 665342007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665342047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250704 + ... + 253343.

It is an arithmetic number, because the mean of its divisors is an integer number (34023240).

Almost surely, 2^665342040 is an apocalyptic number.

665342040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665342040 is an abundant number, since it is smaller than the sum of its proper divisors (1512145320).

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

665342040 is a wasteful number, since it uses less digits than its factorization.

665342040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504072 (or 504068 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 665342040 is about 25794.2249350509. The cubic root of 665342040 is about 873.0014971193.

The spelling of 665342040 in words is "six hundred sixty-five million, three hundred forty-two thousand, forty".