672633754921 has 2 divisors, whose sum is σ = 672633754922. Its totient is φ = 672633754920.

The previous prime is 672633754913. The next prime is 672633754937. The reversal of 672633754921 is 129457336276.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426827022400 + 245806732521 = 653320^2 + 495789^2 .

It is a cyclic number.

It is not a de Polignac number, because 672633754921 - 2³ = 672633754913 is a prime.

It is not a weakly prime, because it can be changed into another prime (672633754721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336316877460 + 336316877461.

It is an arithmetic number, because the mean of its divisors is an integer number (336316877461).

Almost surely, 2^672633754921 is an apocalyptic number.

It is an amenable number.

672633754921 is a deficient number, since it is larger than the sum of its proper divisors (1).

672633754921 is an equidigital number, since it uses as much as digits as its factorization.

672633754921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 55.

The spelling of 672633754921 in words is "six hundred seventy-two billion, six hundred thirty-three million, seven hundred fifty-four thousand, nine hundred twenty-one".