671155015571 has 4 divisors (see below), whose sum is σ = 694298292000. Its totient is φ = 648011739144.

The previous prime is 671155015541. The next prime is 671155015631. The reversal of 671155015571 is 175510551176.

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 671155015571 - 2¹⁰ = 671155014547 is a prime.

It is a super-2 number, since 2×671155015571² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671155015501) 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, 11571638171 + ... + 11571638228.

It is an arithmetic number, because the mean of its divisors is an integer number (173574573000).

Almost surely, 2^671155015571 is an apocalyptic number.

671155015571 is a deficient number, since it is larger than the sum of its proper divisors (23143276429).

671155015571 is a wasteful number, since it uses less digits than its factorization.

671155015571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23143276428.

The product of its (nonzero) digits is 183750, while the sum is 44.

The spelling of 671155015571 in words is "six hundred seventy-one billion, one hundred fifty-five million, fifteen thousand, five hundred seventy-one".