672701681 has 2 divisors, whose sum is σ = 672701682. Its totient is φ = 672701680.

The previous prime is 672701651. The next prime is 672701749. The reversal of 672701681 is 186107276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532871056 + 139830625 = 23084^2 + 11825^2 .

It is a cyclic number.

It is not a de Polignac number, because 672701681 - 2¹⁰ = 672700657 is a prime.

It is a super-2 number, since 2×672701681² = 905055103240451522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (672701651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336350840 + 336350841.

It is an arithmetic number, because the mean of its divisors is an integer number (336350841).

Almost surely, 2^672701681 is an apocalyptic number.

It is an amenable number.

672701681 is a deficient number, since it is larger than the sum of its proper divisors (1).

672701681 is an equidigital number, since it uses as much as digits as its factorization.

672701681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 672701681 is about 25936.4932286537. The cubic root of 672701681 is about 876.2085855574.

The spelling of 672701681 in words is "six hundred seventy-two million, seven hundred one thousand, six hundred eighty-one".