66773766213 has 48 divisors (see below), whose sum is σ = 121772851200. Its totient is φ = 34248558240.

The previous prime is 66773766203. The next prime is 66773766233. The reversal of 66773766213 is 31266737766.

66773766213 is a `hidden beast` number, since 6 + 6 + 7 + 7 + 3 + 7 + 6 + 621 + 3 = 666.

It is not a de Polignac number, because 66773766213 - 2⁴ = 66773766197 is a prime.

It is a super-2 number, since 2×66773766213² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66773766213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66773766203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 555093 + ... + 664586.

It is an arithmetic number, because the mean of its divisors is an integer number (2536934400).

Almost surely, 2^66773766213 is an apocalyptic number.

66773766213 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

66773766213 is a deficient number, since it is larger than the sum of its proper divisors (54999084987).

66773766213 is a wasteful number, since it uses less digits than its factorization.

66773766213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219782 (or 1219779 counting only the distinct ones).

The product of its digits is 8001504, while the sum is 54.

The spelling of 66773766213 in words is "sixty-six billion, seven hundred seventy-three million, seven hundred sixty-six thousand, two hundred thirteen".