64861958269 has 2 divisors, whose sum is σ = 64861958270. Its totient is φ = 64861958268.

The previous prime is 64861958267. The next prime is 64861958299. The reversal of 64861958269 is 96285916846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36782253369 + 28079704900 = 191787^2 + 167570^2 .

It is a cyclic number.

It is not a de Polignac number, because 64861958269 - 2¹ = 64861958267 is a prime.

It is a super-2 number, since 2×64861958269² (a number of 22 digits) contains 22 as substring.

Together with 64861958267, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 64861958269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64861958261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32430979134 + 32430979135.

It is an arithmetic number, because the mean of its divisors is an integer number (32430979135).

Almost surely, 2^64861958269 is an apocalyptic number.

It is an amenable number.

64861958269 is a deficient number, since it is larger than the sum of its proper divisors (1).

64861958269 is an equidigital number, since it uses as much as digits as its factorization.

64861958269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44789760, while the sum is 64.

The spelling of 64861958269 in words is "sixty-four billion, eight hundred sixty-one million, nine hundred fifty-eight thousand, two hundred sixty-nine".