671212116557 has 4 divisors (see below), whose sum is σ = 706539070080. Its totient is φ = 635885163036.

The previous prime is 671212116551. The next prime is 671212116623. The reversal of 671212116557 is 755611212176.

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 671212116557 - 2⁴ = 671212116541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671212116551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17663476733 + ... + 17663476770.

It is an arithmetic number, because the mean of its divisors is an integer number (176634767520).

Almost surely, 2^671212116557 is an apocalyptic number.

It is an amenable number.

671212116557 is a deficient number, since it is larger than the sum of its proper divisors (35326953523).

671212116557 is a wasteful number, since it uses less digits than its factorization.

671212116557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35326953522.

The product of its digits is 176400, while the sum is 44.

The spelling of 671212116557 in words is "six hundred seventy-one billion, two hundred twelve million, one hundred sixteen thousand, five hundred fifty-seven".