642914868853 has 2 divisors, whose sum is σ = 642914868854. Its totient is φ = 642914868852.

The previous prime is 642914868839. The next prime is 642914868859. The reversal of 642914868853 is 358868419246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 573386671729 + 69528197124 = 757223^2 + 263682^2 .

It is a cyclic number.

It is not a de Polignac number, because 642914868853 - 2⁵ = 642914868821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642914868859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321457434426 + 321457434427.

It is an arithmetic number, because the mean of its divisors is an integer number (321457434427).

Almost surely, 2^642914868853 is an apocalyptic number.

It is an amenable number.

642914868853 is a deficient number, since it is larger than the sum of its proper divisors (1).

642914868853 is an equidigital number, since it uses as much as digits as its factorization.

642914868853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79626240, while the sum is 64.

The spelling of 642914868853 in words is "six hundred forty-two billion, nine hundred fourteen million, eight hundred sixty-eight thousand, eight hundred fifty-three".