66830556 has 24 divisors (see below), whose sum is σ = 167933584. Its totient is φ = 20563200.

The previous prime is 66830549. The next prime is 66830591. The reversal of 66830556 is 65503866.

66830556 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

66830556 is strictly pandigital in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214045 + ... + 214356.

Almost surely, 2^66830556 is an apocalyptic number.

It is an amenable number.

66830556 is an abundant number, since it is smaller than the sum of its proper divisors (101103028).

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

66830556 is a wasteful number, since it uses less digits than its factorization.

66830556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428421 (or 428419 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 66830556 is about 8174.9957798154. The cubic root of 66830556 is about 405.8121304759.

The spelling of 66830556 in words is "sixty-six million, eight hundred thirty thousand, five hundred fifty-six".