66602540 has 24 divisors (see below), whose sum is σ = 140762832. Its totient is φ = 26470080.

The previous prime is 66602537. The next prime is 66602567. The reversal of 66602540 is 4520666.

66602540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7466 + ... + 13745.

It is an arithmetic number, because the mean of its divisors is an integer number (5865118).

Almost surely, 2^66602540 is an apocalyptic number.

It is an amenable number.

66602540 is an abundant number, since it is smaller than the sum of its proper divisors (74160292).

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

66602540 is a wasteful number, since it uses less digits than its factorization.

66602540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21377 (or 21375 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66602540 is about 8161.0379241859. The cubic root of 66602540 is about 405.3500808836.

The spelling of 66602540 in words is "sixty-six million, six hundred two thousand, five hundred forty".