66558625387 has 16 divisors (see below), whose sum is σ = 70014688128. Its totient is φ = 63200531520.

The previous prime is 66558625363. The next prime is 66558625409. The reversal of 66558625387 is 78352685566.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66558625387 is a prime.

It is a super-2 number, since 2×66558625387² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66558625337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432228 + ... + 565630.

It is an arithmetic number, because the mean of its divisors is an integer number (4375918008).

Almost surely, 2^66558625387 is an apocalyptic number.

66558625387 is a deficient number, since it is larger than the sum of its proper divisors (3456062741).

66558625387 is a wasteful number, since it uses less digits than its factorization.

66558625387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133770.

The product of its digits is 72576000, while the sum is 61.

The spelling of 66558625387 in words is "sixty-six billion, five hundred fifty-eight million, six hundred twenty-five thousand, three hundred eighty-seven".