660405326271 has 4 divisors (see below), whose sum is σ = 880540435032. Its totient is φ = 440270217512.

The previous prime is 660405326239. The next prime is 660405326333. The reversal of 660405326271 is 172623504066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660405326271 - 2⁵ = 660405326239 is a prime.

It is a super-2 number, since 2×660405326271² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660405321271) 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, 110067554376 + ... + 110067554381.

It is an arithmetic number, because the mean of its divisors is an integer number (220135108758).

Almost surely, 2^660405326271 is an apocalyptic number.

660405326271 is a deficient number, since it is larger than the sum of its proper divisors (220135108761).

660405326271 is a wasteful number, since it uses less digits than its factorization.

660405326271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220135108760.

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 660405326271 in words is "six hundred sixty billion, four hundred five million, three hundred twenty-six thousand, two hundred seventy-one".