665232540 has 48 divisors (see below), whose sum is σ = 2128745472. Its totient is φ = 152053056.

The previous prime is 665232527. The next prime is 665232569. The reversal of 665232540 is 45232566.

665232540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 791524 + ... + 792363.

It is an arithmetic number, because the mean of its divisors is an integer number (44348864).

Almost surely, 2^665232540 is an apocalyptic number.

665232540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665232540 is an abundant number, since it is smaller than the sum of its proper divisors (1463512932).

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

665232540 is a wasteful number, since it uses less digits than its factorization.

665232540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583906 (or 1583904 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 665232540 is about 25792.1022795739. The cubic root of 665232540 is about 872.9536025013.

The spelling of 665232540 in words is "six hundred sixty-five million, two hundred thirty-two thousand, five hundred forty".