628174382681 has 2 divisors, whose sum is σ = 628174382682. Its totient is φ = 628174382680.

The previous prime is 628174382621. The next prime is 628174382713. The reversal of 628174382681 is 186283471826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 505172670025 + 123001712656 = 710755^2 + 350716^2 .

It is a cyclic number.

It is not a de Polignac number, because 628174382681 - 2¹⁰ = 628174381657 is a prime.

It is a super-2 number, since 2×628174382681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (628174382621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314087191340 + 314087191341.

It is an arithmetic number, because the mean of its divisors is an integer number (314087191341).

Almost surely, 2^628174382681 is an apocalyptic number.

It is an amenable number.

628174382681 is a deficient number, since it is larger than the sum of its proper divisors (1).

628174382681 is an equidigital number, since it uses as much as digits as its factorization.

628174382681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6193152, while the sum is 56.

The spelling of 628174382681 in words is "six hundred twenty-eight billion, one hundred seventy-four million, three hundred eighty-two thousand, six hundred eighty-one".