672650943409 has 9 divisors (see below), whose sum is σ = 674157649249. Its totient is φ = 671147602960.

The previous prime is 672650943397. The next prime is 672650943499. The reversal of 672650943409 is 904349056276.

The square root of 672650943409 is 820153.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 87536098225 + 585114845184 = 295865^2 + 764928^2 .

It is not a de Polignac number, because 672650943409 - 2⁷ = 672650943281 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 672650943409.

It is not an unprimeable number, because it can be changed into a prime (672650943499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 633977739 + ... + 633978799.

Almost surely, 2^672650943409 is an apocalyptic number.

672650943409 is the 820153-rd square number.

672650943409 is the 410077-th centered octagonal number.

It is an amenable number.

672650943409 is a deficient number, since it is larger than the sum of its proper divisors (1506705840).

672650943409 is an frugal number, since it uses more digits than its factorization.

672650943409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3668 (or 1834 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 55.

The spelling of 672650943409 in words is "six hundred seventy-two billion, six hundred fifty million, nine hundred forty-three thousand, four hundred nine".