666784011229 has 4 divisors (see below), whose sum is σ = 762038869984. Its totient is φ = 571529152476.

The previous prime is 666784011143. The next prime is 666784011281. The reversal of 666784011229 is 922110487666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666784011229 - 2¹¹ = 666784009181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666784011329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47627429367 + ... + 47627429380.

It is an arithmetic number, because the mean of its divisors is an integer number (190509717496).

Almost surely, 2^666784011229 is an apocalyptic number.

It is an amenable number.

666784011229 is a deficient number, since it is larger than the sum of its proper divisors (95254858755).

666784011229 is an equidigital number, since it uses as much as digits as its factorization.

666784011229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95254858754.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 666784011229 in words is "six hundred sixty-six billion, seven hundred eighty-four million, eleven thousand, two hundred twenty-nine".