671118942551 has 2 divisors, whose sum is σ = 671118942552. Its totient is φ = 671118942550.

The previous prime is 671118942499. The next prime is 671118942709. The reversal of 671118942551 is 155249811176.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 671118942551 - 2³⁴ = 653939073367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 671118942551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671118942251) 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 as a sum of consecutive naturals, namely, 335559471275 + 335559471276.

It is an arithmetic number, because the mean of its divisors is an integer number (335559471276).

Almost surely, 2^671118942551 is an apocalyptic number.

671118942551 is a deficient number, since it is larger than the sum of its proper divisors (1).

671118942551 is an equidigital number, since it uses as much as digits as its factorization.

671118942551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 50.

The spelling of 671118942551 in words is "six hundred seventy-one billion, one hundred eighteen million, nine hundred forty-two thousand, five hundred fifty-one".