66896557285 has 8 divisors (see below), whose sum is σ = 84997978776. Its totient is φ = 50369172480.

The previous prime is 66896557243. The next prime is 66896557297. The reversal of 66896557285 is 58275569866.

It can be written as a sum of positive squares in 4 ways, for example, as 19662489729 + 47234067556 = 140223^2 + 217334^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-66896557285 is a prime.

It is a super-3 number, since 3×66896557285³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66896557285.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393509076 + ... + 393509245.

It is an arithmetic number, because the mean of its divisors is an integer number (10624747347).

Almost surely, 2^66896557285 is an apocalyptic number.

It is an amenable number.

66896557285 is a deficient number, since it is larger than the sum of its proper divisors (18101421491).

66896557285 is a wasteful number, since it uses less digits than its factorization.

66896557285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787018343.

The product of its digits is 217728000, while the sum is 67.

The spelling of 66896557285 in words is "sixty-six billion, eight hundred ninety-six million, five hundred fifty-seven thousand, two hundred eighty-five".