66505539325 has 24 divisors (see below), whose sum is σ = 86275728000. Its totient is φ = 50802326400.

The previous prime is 66505539281. The next prime is 66505539337. The reversal of 66505539325 is 52393550566.

It is not a de Polignac number, because 66505539325 - 2¹⁷ = 66505408253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 642075 + ... + 738424.

It is an arithmetic number, because the mean of its divisors is an integer number (3594822000).

Almost surely, 2^66505539325 is an apocalyptic number.

It is an amenable number.

66505539325 is a deficient number, since it is larger than the sum of its proper divisors (19770188675).

66505539325 is a wasteful number, since it uses less digits than its factorization.

66505539325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380597 (or 1380592 counting only the distinct ones).

The product of its (nonzero) digits is 3645000, while the sum is 49.

The spelling of 66505539325 in words is "sixty-six billion, five hundred five million, five hundred thirty-nine thousand, three hundred twenty-five".