66566460 has 48 divisors (see below), whose sum is σ = 186955776. Its totient is φ = 17696832.

The previous prime is 66566459. The next prime is 66566473. The reversal of 66566460 is 6466566.

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, 20509 + ... + 23531.

It is an arithmetic number, because the mean of its divisors is an integer number (3894912).

Almost surely, 2^66566460 is an apocalyptic number.

66566460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66566460 is an abundant number, since it is smaller than the sum of its proper divisors (120389316).

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

66566460 is a wasteful number, since it uses less digits than its factorization.

66566460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3402 (or 3400 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 66566460 is about 8158.8271215905. The cubic root of 66566460 is about 405.2768721010.

The spelling of 66566460 in words is "sixty-six million, five hundred sixty-six thousand, four hundred sixty".