634942543070389 has 2 divisors, whose sum is σ = 634942543070390. Its totient is φ = 634942543070388.

The previous prime is 634942543070333. The next prime is 634942543070477. The reversal of 634942543070389 is 983070345249436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 574067703284100 + 60874839786289 = 23959710^2 + 7802233^2 .

It is a cyclic number.

It is not a de Polignac number, because 634942543070389 - 2¹³ = 634942543062197 is a prime.

It is a super-2 number, since 2×634942543070389² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634942540070389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317471271535194 + 317471271535195.

It is an arithmetic number, because the mean of its divisors is an integer number (317471271535195).

Almost surely, 2^{634942543070389} is an apocalyptic number.

It is an amenable number.

634942543070389 is a deficient number, since it is larger than the sum of its proper divisors (1).

634942543070389 is an equidigital number, since it uses as much as digits as its factorization.

634942543070389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 470292480, while the sum is 67.

The spelling of 634942543070389 in words is "six hundred thirty-four trillion, nine hundred forty-two billion, five hundred forty-three million, seventy thousand, three hundred eighty-nine".