64187378237 has 2 divisors, whose sum is σ = 64187378238. Its totient is φ = 64187378236.

The previous prime is 64187378221. The next prime is 64187378243. The reversal of 64187378237 is 73287378146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63695159641 + 492218596 = 252379^2 + 22186^2 .

It is a cyclic number.

It is not a de Polignac number, because 64187378237 - 2⁴ = 64187378221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64187378137) 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, 32093689118 + 32093689119.

It is an arithmetic number, because the mean of its divisors is an integer number (32093689119).

Almost surely, 2^64187378237 is an apocalyptic number.

It is an amenable number.

64187378237 is a deficient number, since it is larger than the sum of its proper divisors (1).

64187378237 is an equidigital number, since it uses as much as digits as its factorization.

64187378237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9483264, while the sum is 56.

Subtracting 64187378237 from its reverse (73287378146), we obtain a palindrome (9099999909).

The spelling of 64187378237 in words is "sixty-four billion, one hundred eighty-seven million, three hundred seventy-eight thousand, two hundred thirty-seven".