672445440281 has 2 divisors, whose sum is σ = 672445440282. Its totient is φ = 672445440280.

The previous prime is 672445440257. The next prime is 672445440379. The reversal of 672445440281 is 182044544276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504832986256 + 167612454025 = 710516^2 + 409405^2 .

It is a cyclic number.

It is not a de Polignac number, because 672445440281 - 2⁶ = 672445440217 is a prime.

It is a super-2 number, since 2×672445440281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (672445440481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336222720140 + 336222720141.

It is an arithmetic number, because the mean of its divisors is an integer number (336222720141).

Almost surely, 2^672445440281 is an apocalyptic number.

It is an amenable number.

672445440281 is a deficient number, since it is larger than the sum of its proper divisors (1).

672445440281 is an equidigital number, since it uses as much as digits as its factorization.

672445440281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1720320, while the sum is 47.

The spelling of 672445440281 in words is "six hundred seventy-two billion, four hundred forty-five million, four hundred forty thousand, two hundred eighty-one".