66725102557 has 8 divisors (see below), whose sum is σ = 70395507360. Its totient is φ = 63070553520.

The previous prime is 66725102531. The next prime is 66725102599. The reversal of 66725102557 is 75520152766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66725102557 - 2¹⁹ = 66724578269 is a prime.

It is a super-2 number, since 2×66725102557² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66725102657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3955294 + ... + 3972127.

It is an arithmetic number, because the mean of its divisors is an integer number (8799438420).

Almost surely, 2^66725102557 is an apocalyptic number.

It is an amenable number.

66725102557 is a deficient number, since it is larger than the sum of its proper divisors (3670404803).

66725102557 is a wasteful number, since it uses less digits than its factorization.

66725102557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7927883.

The product of its (nonzero) digits is 882000, while the sum is 46.

The spelling of 66725102557 in words is "sixty-six billion, seven hundred twenty-five million, one hundred two thousand, five hundred fifty-seven".