66287819261 has 8 divisors (see below), whose sum is σ = 66420513600. Its totient is φ = 66155199552.

The previous prime is 66287819233. The next prime is 66287819293. The reversal of 66287819261 is 16291878266.

It is a happy number.

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 66287819261 - 2¹⁸ = 66287557117 is a prime.

It is a super-2 number, since 2×66287819261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66287819197 and 66287819206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66287819561) 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, 1967786 + ... + 2001188.

It is an arithmetic number, because the mean of its divisors is an integer number (8302564200).

Almost surely, 2^66287819261 is an apocalyptic number.

It is an amenable number.

66287819261 is a deficient number, since it is larger than the sum of its proper divisors (132694339).

66287819261 is a wasteful number, since it uses less digits than its factorization.

66287819261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37315.

The product of its digits is 3483648, while the sum is 56.

The spelling of 66287819261 in words is "sixty-six billion, two hundred eighty-seven million, eight hundred nineteen thousand, two hundred sixty-one".