65994281557 has 8 divisors (see below), whose sum is σ = 66055462200. Its totient is φ = 65933129664.

The previous prime is 65994281531. The next prime is 65994281581. The reversal of 65994281557 is 75518249956.

It can be written as a sum of positive squares in 4 ways, for example, as 14104175121 + 51890106436 = 118761^2 + 227794^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65994281557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65994281495 and 65994281504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65994281057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9604119 + ... + 9610987.

It is an arithmetic number, because the mean of its divisors is an integer number (8256932775).

Almost surely, 2^65994281557 is an apocalyptic number.

It is an amenable number.

65994281557 is a deficient number, since it is larger than the sum of its proper divisors (61180643).

65994281557 is a wasteful number, since it uses less digits than its factorization.

65994281557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14375.

The product of its digits is 27216000, while the sum is 61.

The spelling of 65994281557 in words is "sixty-five billion, nine hundred ninety-four million, two hundred eighty-one thousand, five hundred fifty-seven".