66461560 has 32 divisors (see below), whose sum is σ = 163134000. Its totient is φ = 24167680.

The previous prime is 66461557. The next prime is 66461581. The reversal of 66461560 is 6516466.

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, 75085 + ... + 75964.

Almost surely, 2^66461560 is an apocalyptic number.

It is an amenable number.

66461560 is an abundant number, since it is smaller than the sum of its proper divisors (96672440).

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

66461560 is a wasteful number, since it uses less digits than its factorization.

66461560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151071 (or 151067 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 66461560 is about 8152.3959668309. The cubic root of 66461560 is about 405.0638724644.

The spelling of 66461560 in words is "sixty-six million, four hundred sixty-one thousand, five hundred sixty".