671118942553 has 4 divisors (see below), whose sum is σ = 676241988048. Its totient is φ = 665995897060.

The previous prime is 671118942551. The next prime is 671118942709. The reversal of 671118942553 is 355249811176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 671118942553 - 2¹ = 671118942551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671118942553.

It is not an unprimeable number, because it can be changed into a prime (671118942551) 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, 2561522551 + ... + 2561522812.

It is an arithmetic number, because the mean of its divisors is an integer number (169060497012).

Almost surely, 2^671118942553 is an apocalyptic number.

It is an amenable number.

671118942553 is a deficient number, since it is larger than the sum of its proper divisors (5123045495).

671118942553 is a wasteful number, since it uses less digits than its factorization.

671118942553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5123045494.

The product of its digits is 1814400, while the sum is 52.

The spelling of 671118942553 in words is "six hundred seventy-one billion, one hundred eighteen million, nine hundred forty-two thousand, five hundred fifty-three".