664421376134427 has 8 divisors (see below), whose sum is σ = 885965416042560. Its totient is φ = 442912460157960.

The previous prime is 664421376134413. The next prime is 664421376134473. The reversal of 664421376134427 is 724431673124466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664421376134427 - 2⁶ = 664421376134363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664421376134497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8780938777 + ... + 8781014442.

It is an arithmetic number, because the mean of its divisors is an integer number (110745677005320).

Almost surely, 2^{664421376134427} is an apocalyptic number.

664421376134427 is a deficient number, since it is larger than the sum of its proper divisors (221544039908133).

664421376134427 is a wasteful number, since it uses less digits than its factorization.

664421376134427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17561965833.

The product of its digits is 97542144, while the sum is 60.

The spelling of 664421376134427 in words is "six hundred sixty-four trillion, four hundred twenty-one billion, three hundred seventy-six million, one hundred thirty-four thousand, four hundred twenty-seven".