674187816551 has 2 divisors, whose sum is σ = 674187816552. Its totient is φ = 674187816550.

The previous prime is 674187816509. The next prime is 674187816553. The reversal of 674187816551 is 155618781476.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-674187816551 is a prime.

It is a Sophie Germain prime.

Together with 674187816553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (674187816553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337093908275 + 337093908276.

It is an arithmetic number, because the mean of its divisors is an integer number (337093908276).

Almost surely, 2^674187816551 is an apocalyptic number.

674187816551 is a deficient number, since it is larger than the sum of its proper divisors (1).

674187816551 is an equidigital number, since it uses as much as digits as its factorization.

674187816551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11289600, while the sum is 59.

The spelling of 674187816551 in words is "six hundred seventy-four billion, one hundred eighty-seven million, eight hundred sixteen thousand, five hundred fifty-one".