642854575427 has 2 divisors, whose sum is σ = 642854575428. Its totient is φ = 642854575426.

The previous prime is 642854575393. The next prime is 642854575457. The reversal of 642854575427 is 724575458246.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642854575427 is a prime.

It is not a weakly prime, because it can be changed into another prime (642854575457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321427287713 + 321427287714.

It is an arithmetic number, because the mean of its divisors is an integer number (321427287714).

Almost surely, 2^642854575427 is an apocalyptic number.

642854575427 is a deficient number, since it is larger than the sum of its proper divisors (1).

642854575427 is an equidigital number, since it uses as much as digits as its factorization.

642854575427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264000, while the sum is 59.

The spelling of 642854575427 in words is "six hundred forty-two billion, eight hundred fifty-four million, five hundred seventy-five thousand, four hundred twenty-seven".