666006701723 has 4 divisors (see below), whose sum is σ = 726552765528. Its totient is φ = 605460637920.

The previous prime is 666006701693. The next prime is 666006701827. The reversal of 666006701723 is 327107600666.

666006701723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666006701723 - 2²⁴ = 665989924507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666006701623) 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, 30273031886 + ... + 30273031907.

It is an arithmetic number, because the mean of its divisors is an integer number (181638191382).

Almost surely, 2^666006701723 is an apocalyptic number.

666006701723 is a deficient number, since it is larger than the sum of its proper divisors (60546063805).

666006701723 is a wasteful number, since it uses less digits than its factorization.

666006701723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60546063804.

The product of its (nonzero) digits is 381024, while the sum is 44.

The spelling of 666006701723 in words is "six hundred sixty-six billion, six million, seven hundred one thousand, seven hundred twenty-three".