66613634 has 4 divisors (see below), whose sum is σ = 99920454. Its totient is φ = 33306816.

The previous prime is 66613627. The next prime is 66613649. The reversal of 66613634 is 43631666.

66613634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 51768025 + 14845609 = 7195^2 + 3853^2 .

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 66613594 and 66613603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16653407 + ... + 16653410.

Almost surely, 2^66613634 is an apocalyptic number.

66613634 is a deficient number, since it is larger than the sum of its proper divisors (33306820).

66613634 is a wasteful number, since it uses less digits than its factorization.

66613634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33306819.

The product of its digits is 46656, while the sum is 35.

The square root of 66613634 is about 8161.7175888412. The cubic root of 66613634 is about 405.3725860520.

The spelling of 66613634 in words is "sixty-six million, six hundred thirteen thousand, six hundred thirty-four".