66580540 has 24 divisors (see below), whose sum is σ = 150575040. Its totient is φ = 24583488.

The previous prime is 66580537. The next prime is 66580543. The reversal of 66580540 is 4508566.

It is an interprime number because it is at equal distance from previous prime (66580537) and next prime (66580543).

It is a junction number, because it is equal to n+sod(n) for n = 66580496 and 66580505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66580543) 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 7 ways as a sum of consecutive naturals, for example, 127780 + ... + 128299.

It is an arithmetic number, because the mean of its divisors is an integer number (6273960).

Almost surely, 2^66580540 is an apocalyptic number.

It is an amenable number.

66580540 is an abundant number, since it is smaller than the sum of its proper divisors (83994500).

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

66580540 is a wasteful number, since it uses less digits than its factorization.

66580540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256101 (or 256099 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 66580540 is about 8159.6899450898. The cubic root of 66580540 is about 405.3054445286.

The spelling of 66580540 in words is "sixty-six million, five hundred eighty thousand, five hundred forty".