666702681253 has 4 divisors (see below), whose sum is σ = 761945921440. Its totient is φ = 571459441068.

The previous prime is 666702681233. The next prime is 666702681289. The reversal of 666702681253 is 352186207666.

666702681253 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 352186207666 = 2 ⋅176093103833.

It is a cyclic number.

It is not a de Polignac number, because 666702681253 - 2³⁷ = 529263727781 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666702681253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666702681233) 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, 47621620083 + ... + 47621620096.

It is an arithmetic number, because the mean of its divisors is an integer number (190486480360).

Almost surely, 2^666702681253 is an apocalyptic number.

It is an amenable number.

666702681253 is a deficient number, since it is larger than the sum of its proper divisors (95243240187).

666702681253 is an equidigital number, since it uses as much as digits as its factorization.

666702681253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95243240186.

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 666702681253 in words is "six hundred sixty-six billion, seven hundred two million, six hundred eighty-one thousand, two hundred fifty-three".