666056551071 has 16 divisors (see below), whose sum is σ = 896833473536. Its totient is φ = 439659972576.

The previous prime is 666056551067. The next prime is 666056551073. The reversal of 666056551071 is 170155650666.

It is not a de Polignac number, because 666056551071 - 2² = 666056551067 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 666056551071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666056551073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1920426 + ... + 2240568.

It is an arithmetic number, because the mean of its divisors is an integer number (56052092096).

Almost surely, 2^666056551071 is an apocalyptic number.

666056551071 is a deficient number, since it is larger than the sum of its proper divisors (230776922465).

666056551071 is a wasteful number, since it uses less digits than its factorization.

666056551071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326982.

The product of its (nonzero) digits is 1134000, while the sum is 48.

The spelling of 666056551071 in words is "six hundred sixty-six billion, fifty-six million, five hundred fifty-one thousand, seventy-one".