66542430 has 32 divisors (see below), whose sum is σ = 164855808. Its totient is φ = 17172000.

The previous prime is 66542417. The next prime is 66542431. The reversal of 66542430 is 3424566.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66542431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34846 + ... + 36705.

It is an arithmetic number, because the mean of its divisors is an integer number (5151744).

Almost surely, 2^66542430 is an apocalyptic number.

66542430 is an abundant number, since it is smaller than the sum of its proper divisors (98313378).

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

66542430 is a wasteful number, since it uses less digits than its factorization.

66542430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71592.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 66542430 is about 8157.3543505232. The cubic root of 66542430 is about 405.2280989133.

Adding to 66542430 its reverse (3424566), we get a palindrome (69966996).

The spelling of 66542430 in words is "sixty-six million, five hundred forty-two thousand, four hundred thirty".