66777025057 has 8 divisors (see below), whose sum is σ = 69875807976. Its totient is φ = 63746347392.

The previous prime is 66777025039. The next prime is 66777025061. The reversal of 66777025057 is 75052077766.

It can be written as a sum of positive squares in 4 ways, for example, as 27398194576 + 39378830481 = 165524^2 + 198441^2 .

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 66777025057 - 2⁷ = 66777024929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66777024995 and 66777025013.

It is not an unprimeable number, because it can be changed into a prime (66777025037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17024308 + ... + 17028229.

It is an arithmetic number, because the mean of its divisors is an integer number (8734475997).

Almost surely, 2^66777025057 is an apocalyptic number.

It is an amenable number.

66777025057 is a deficient number, since it is larger than the sum of its proper divisors (3098782919).

66777025057 is a wasteful number, since it uses less digits than its factorization.

66777025057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34052627.

The product of its (nonzero) digits is 4321800, while the sum is 52.

The spelling of 66777025057 in words is "sixty-six billion, seven hundred seventy-seven million, twenty-five thousand, fifty-seven".