623400667321 has 2 divisors, whose sum is σ = 623400667322. Its totient is φ = 623400667320.

The previous prime is 623400667283. The next prime is 623400667367. The reversal of 623400667321 is 123766004326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 338206218025 + 285194449296 = 581555^2 + 534036^2 .

It is a cyclic number.

It is not a de Polignac number, because 623400667321 - 2¹³ = 623400659129 is a prime.

It is not a weakly prime, because it can be changed into another prime (623400661321) 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, 311700333660 + 311700333661.

It is an arithmetic number, because the mean of its divisors is an integer number (311700333661).

Almost surely, 2^623400667321 is an apocalyptic number.

It is an amenable number.

623400667321 is a deficient number, since it is larger than the sum of its proper divisors (1).

623400667321 is an equidigital number, since it uses as much as digits as its factorization.

623400667321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 40.

The spelling of 623400667321 in words is "six hundred twenty-three billion, four hundred million, six hundred sixty-seven thousand, three hundred twenty-one".