642558612247 has 2 divisors, whose sum is σ = 642558612248. Its totient is φ = 642558612246.

The previous prime is 642558612217. The next prime is 642558612299. The reversal of 642558612247 is 742216855246.

It is a happy number.

It is an a-pointer prime, because the next prime (642558612299) can be obtained adding 642558612247 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642558612247 - 2⁷ = 642558612119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642558612194 and 642558612203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642558612217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321279306123 + 321279306124.

It is an arithmetic number, because the mean of its divisors is an integer number (321279306124).

Almost surely, 2^642558612247 is an apocalyptic number.

642558612247 is a deficient number, since it is larger than the sum of its proper divisors (1).

642558612247 is an equidigital number, since it uses as much as digits as its factorization.

642558612247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6451200, while the sum is 52.

The spelling of 642558612247 in words is "six hundred forty-two billion, five hundred fifty-eight million, six hundred twelve thousand, two hundred forty-seven".