66542260 has 24 divisors (see below), whose sum is σ = 139892256. Its totient is φ = 26587680.

The previous prime is 66542251. The next prime is 66542279. The reversal of 66542260 is 6224566.

It is a congruent number.

It is an unprimeable number.

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, 33495 + ... + 35425.

It is an arithmetic number, because the mean of its divisors is an integer number (5828844).

Almost surely, 2^66542260 is an apocalyptic number.

It is an amenable number.

66542260 is an abundant number, since it is smaller than the sum of its proper divisors (73349996).

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

66542260 is a wasteful number, since it uses less digits than its factorization.

66542260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3663 (or 3661 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 66542260 is about 8157.3439304715. The cubic root of 66542260 is about 405.2277538260.

The spelling of 66542260 in words is "sixty-six million, five hundred forty-two thousand, two hundred sixty".