64623840171251 has 2 divisors, whose sum is σ = 64623840171252. Its totient is φ = 64623840171250.

The previous prime is 64623840171229. The next prime is 64623840171307. The reversal of 64623840171251 is 15217104832646.

It is a happy number.

64623840171251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64623840171251 - 2¹⁸ = 64623839909107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64623840171251.

It is not a weakly prime, because it can be changed into another prime (64623840171851) 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, 32311920085625 + 32311920085626.

It is an arithmetic number, because the mean of its divisors is an integer number (32311920085626).

Almost surely, 2^{64623840171251} is an apocalyptic number.

64623840171251 is a deficient number, since it is larger than the sum of its proper divisors (1).

64623840171251 is an equidigital number, since it uses as much as digits as its factorization.

64623840171251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 64623840171251 in words is "sixty-four trillion, six hundred twenty-three billion, eight hundred forty million, one hundred seventy-one thousand, two hundred fifty-one".