664127943111 has 24 divisors (see below), whose sum is σ = 1010031875840. Its totient is φ = 419346752400.

The previous prime is 664127943091. The next prime is 664127943133. The reversal of 664127943111 is 111349721466.

664127943111 is a `hidden beast` number, since 6 + 64 + 1 + 279 + 4 + 311 + 1 = 666.

It is not a de Polignac number, because 664127943111 - 2¹⁰ = 664127942087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664127942111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 230616 + ... + 1175346.

Almost surely, 2^664127943111 is an apocalyptic number.

664127943111 is a deficient number, since it is larger than the sum of its proper divisors (345903932729).

664127943111 is a wasteful number, since it uses less digits than its factorization.

664127943111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948867 (or 948864 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 664127943111 in words is "six hundred sixty-four billion, one hundred twenty-seven million, nine hundred forty-three thousand, one hundred eleven".