666530145013 has 4 divisors (see below), whose sum is σ = 705737800620. Its totient is φ = 627322489408.

The previous prime is 666530145011. The next prime is 666530145049. The reversal of 666530145013 is 310541035666.

666530145013 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 can be written as a sum of positive squares in 2 ways, for example, as 186505650769 + 480024494244 = 431863^2 + 692838^2 .

It is a cyclic number.

It is not a de Polignac number, because 666530145013 - 2¹ = 666530145011 is a prime.

It is a super-2 number, since 2×666530145013² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666530145011) 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, 19603827778 + ... + 19603827811.

It is an arithmetic number, because the mean of its divisors is an integer number (176434450155).

Almost surely, 2^666530145013 is an apocalyptic number.

It is an amenable number.

666530145013 is a deficient number, since it is larger than the sum of its proper divisors (39207655607).

666530145013 is a wasteful number, since it uses less digits than its factorization.

666530145013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39207655606.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 666530145013 in words is "six hundred sixty-six billion, five hundred thirty million, one hundred forty-five thousand, thirteen".