66558237475 has 6 divisors (see below), whose sum is σ = 82532214500. Its totient is φ = 53246589960.

The previous prime is 66558237439. The next prime is 66558237503. The reversal of 66558237475 is 57473285566.

It is a happy number.

It is not a de Polignac number, because 66558237475 - 2⁹ = 66558236963 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1331164725 + ... + 1331164774.

Almost surely, 2^66558237475 is an apocalyptic number.

66558237475 is a deficient number, since it is larger than the sum of its proper divisors (15973977025).

66558237475 is a wasteful number, since it uses less digits than its factorization.

66558237475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662329509 (or 2662329504 counting only the distinct ones).

The product of its digits is 42336000, while the sum is 58.

The spelling of 66558237475 in words is "sixty-six billion, five hundred fifty-eight million, two hundred thirty-seven thousand, four hundred seventy-five".