671272720857 has 24 divisors (see below), whose sum is σ = 1020683231360. Its totient is φ = 423947325600.

The previous prime is 671272720849. The next prime is 671272720873. The reversal of 671272720857 is 758027272176.

It is not a de Polignac number, because 671272720857 - 2³ = 671272720849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671272720817) 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, 7470963 + ... + 7560279.

Almost surely, 2^671272720857 is an apocalyptic number.

It is an amenable number.

671272720857 is a deficient number, since it is larger than the sum of its proper divisors (349410510503).

671272720857 is a wasteful number, since it uses less digits than its factorization.

671272720857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133293 (or 133290 counting only the distinct ones).

The product of its (nonzero) digits is 4609920, while the sum is 54.

The spelling of 671272720857 in words is "six hundred seventy-one billion, two hundred seventy-two million, seven hundred twenty thousand, eight hundred fifty-seven".