668271728571 has 8 divisors (see below), whose sum is σ = 891040956240. Its totient is φ = 445508493312.

The previous prime is 668271728563. The next prime is 668271728587. The reversal of 668271728571 is 175827172866.

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

It is not a de Polignac number, because 668271728571 - 2³ = 668271728563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668271728521) 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, 1231090 + ... + 1688823.

It is an arithmetic number, because the mean of its divisors is an integer number (111380119530).

Almost surely, 2^668271728571 is an apocalyptic number.

668271728571 is a deficient number, since it is larger than the sum of its proper divisors (222769227669).

668271728571 is a wasteful number, since it uses less digits than its factorization.

668271728571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2996205.

The product of its digits is 15805440, while the sum is 60.

The spelling of 668271728571 in words is "six hundred sixty-eight billion, two hundred seventy-one million, seven hundred twenty-eight thousand, five hundred seventy-one".