642968267 has 2 divisors, whose sum is σ = 642968268. Its totient is φ = 642968266.

The previous prime is 642968239. The next prime is 642968297. The reversal of 642968267 is 762869246.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642968267 - 2¹⁶ = 642902731 is a prime.

It is not a weakly prime, because it can be changed into another prime (642968297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321484133 + 321484134.

It is an arithmetic number, because the mean of its divisors is an integer number (321484134).

Almost surely, 2^642968267 is an apocalyptic number.

642968267 is a deficient number, since it is larger than the sum of its proper divisors (1).

642968267 is an equidigital number, since it uses as much as digits as its factorization.

642968267 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 50.

The square root of 642968267 is about 25356.8189448125. The cubic root of 642968267 is about 863.1041002612.

The spelling of 642968267 in words is "six hundred forty-two million, nine hundred sixty-eight thousand, two hundred sixty-seven".