674723740356521 has 2 divisors, whose sum is σ = 674723740356522. Its totient is φ = 674723740356520.

The previous prime is 674723740356511. The next prime is 674723740356539. The reversal of 674723740356521 is 125653047327476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556755359600896 + 117968380755625 = 23595664^2 + 10861325^2 .

It is a cyclic number.

It is not a de Polignac number, because 674723740356521 - 2¹⁸ = 674723740094377 is a prime.

It is not a weakly prime, because it can be changed into another prime (674723740356511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337361870178260 + 337361870178261.

It is an arithmetic number, because the mean of its divisors is an integer number (337361870178261).

Almost surely, 2^{674723740356521} is an apocalyptic number.

It is an amenable number.

674723740356521 is a deficient number, since it is larger than the sum of its proper divisors (1).

674723740356521 is an equidigital number, since it uses as much as digits as its factorization.

674723740356521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 177811200, while the sum is 62.

The spelling of 674723740356521 in words is "six hundred seventy-four trillion, seven hundred twenty-three billion, seven hundred forty million, three hundred fifty-six thousand, five hundred twenty-one".