66765353278 has 48 divisors (see below), whose sum is σ = 114457276800. Its totient is φ = 29114860320.

The previous prime is 66765353251. The next prime is 66765353309. The reversal of 66765353278 is 87235356766.

It is a super-2 number, since 2×66765353278² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2420223 + ... + 2447653.

It is an arithmetic number, because the mean of its divisors is an integer number (2384526600).

Almost surely, 2^66765353278 is an apocalyptic number.

66765353278 is a deficient number, since it is larger than the sum of its proper divisors (47691923522).

66765353278 is a wasteful number, since it uses less digits than its factorization.

66765353278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27857 (or 27844 counting only the distinct ones).

The product of its digits is 38102400, while the sum is 58.

The spelling of 66765353278 in words is "sixty-six billion, seven hundred sixty-five million, three hundred fifty-three thousand, two hundred seventy-eight".