66503430 has 160 divisors (see below), whose sum is σ = 210551616. Its totient is φ = 14743296.

The previous prime is 66503429. The next prime is 66503461. The reversal of 66503430 is 3430566.

66503430 is a `hidden beast` number, since 6 + 650 + 3 + 4 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 66503394 and 66503403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 209632 + ... + 209948.

Almost surely, 2^66503430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66503430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105275808).

66503430 is an abundant number, since it is smaller than the sum of its proper divisors (144048186).

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

66503430 is a wasteful number, since it uses less digits than its factorization.

66503430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 66503430 is about 8154.9635192317. The cubic root of 66503430 is about 405.1489164309.

66503430 divided by its sum of digits (27) gives a triangular number (2463090 = T₂₂₁₉).

Adding to 66503430 its reverse (3430566), we get a palindrome (69933996).

The spelling of 66503430 in words is "sixty-six million, five hundred three thousand, four hundred thirty".