66587474 has 4 divisors (see below), whose sum is σ = 99881214. Its totient is φ = 33293736.

The previous prime is 66587471. The next prime is 66587483. The reversal of 66587474 is 47478566.

It is a happy number.

66587474 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., 52200625 + 14386849 = 7225^2 + 3793^2 .

It is not an unprimeable number, because it can be changed into a prime (66587471) by changing a digit.

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, 16646867 + ... + 16646870.

Almost surely, 2^66587474 is an apocalyptic number.

66587474 is a deficient number, since it is larger than the sum of its proper divisors (33293740).

66587474 is a wasteful number, since it uses less digits than its factorization.

66587474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33293739.

The product of its digits is 1128960, while the sum is 47.

The square root of 66587474 is about 8160.1148276234. The cubic root of 66587474 is about 405.3195141572.

The spelling of 66587474 in words is "sixty-six million, five hundred eighty-seven thousand, four hundred seventy-four".